Endocrine System - AP Biology
Card 0 of 840
causes testosterone production in males and triggers ovulation in females.
causes testosterone production in males and triggers ovulation in females.
Tap to see back →
The hormone described in the question is luteinizing hormone (LH). If fertilization occurs, the LH levels will decrease and human chorionic gonadotropin (hCG) is released from the placenta to simulate LH function.
The hormone described in the question is luteinizing hormone (LH). If fertilization occurs, the LH levels will decrease and human chorionic gonadotropin (hCG) is released from the placenta to simulate LH function.
The pancreas is responsible for regulating blood sugar levels through the release of insulin and glucagon. In Type I Diabetic individuals the body has high blood sugar due to the inability to produce insulin, which is responsible for lowering blood sugar. In an individual with Type II Diabetes the body produces insulin, however, the receptors have become insensitive to the presence of insulin. What effect will injecting additional insulin have in an individual with Type II Diabetes?
The pancreas is responsible for regulating blood sugar levels through the release of insulin and glucagon. In Type I Diabetic individuals the body has high blood sugar due to the inability to produce insulin, which is responsible for lowering blood sugar. In an individual with Type II Diabetes the body produces insulin, however, the receptors have become insensitive to the presence of insulin. What effect will injecting additional insulin have in an individual with Type II Diabetes?
Tap to see back →
Because insulin receptors have been desensitized to insulin, the addition of more insulin will not have any effect. This is why Type II Diabetes is much more difficult to treat than Type I. The recommended course of action for individuals with Type II diabetes is to eat healthy and exercise.
Because insulin receptors have been desensitized to insulin, the addition of more insulin will not have any effect. This is why Type II Diabetes is much more difficult to treat than Type I. The recommended course of action for individuals with Type II diabetes is to eat healthy and exercise.
Which of the following is produced by the pituitary gland?
Which of the following is produced by the pituitary gland?
Tap to see back →
The hormones secreted by the pituitary gland are FLAT PEG: Follicle-stimulating hormone, luteinizing hormone, adrenocorticotropic hormone, thyroid-stimulating hormone, prolactin, endorphins, and growth hormone. Testosterone is produced in the testes in males, and in the adrenal gland in both males and females. Insulin is produced by the pancreas. Estrogen is produced by the ovaries in females, and in the adrenal gland in both males and females.
The hormones secreted by the pituitary gland are FLAT PEG: Follicle-stimulating hormone, luteinizing hormone, adrenocorticotropic hormone, thyroid-stimulating hormone, prolactin, endorphins, and growth hormone. Testosterone is produced in the testes in males, and in the adrenal gland in both males and females. Insulin is produced by the pancreas. Estrogen is produced by the ovaries in females, and in the adrenal gland in both males and females.
The corpus luteum releases progesterone to prevent menstruation from occurring; if an ovum is not fertilized, then menstruation occurs. What happens to progesterone levels if the ovum is not fertilized?
The corpus luteum releases progesterone to prevent menstruation from occurring; if an ovum is not fertilized, then menstruation occurs. What happens to progesterone levels if the ovum is not fertilized?
Tap to see back →
In order for menstruation to occur, progesterone levels must decrease. When fertilization does not occur, the corpus luteum ceases progesterone production, initiating menstruation. The corpus luteum then transitions into the corpus albicans and removed from the ovary in preparation for the new menstrual cycle.
In order for menstruation to occur, progesterone levels must decrease. When fertilization does not occur, the corpus luteum ceases progesterone production, initiating menstruation. The corpus luteum then transitions into the corpus albicans and removed from the ovary in preparation for the new menstrual cycle.
While walking home from class one afternoon, you take a shortcut that leads you in front of a house that is guarded by a huge, barking dog. Unfortunately, you are terrified of dogs! Though the dog is unable to escape its yard, as you walk past you notice yourself breathing more quickly than normal and you can feel your heart racing and your palms sweating. Which of your glands is most likely responsible for your physiological reaction to the dog?
While walking home from class one afternoon, you take a shortcut that leads you in front of a house that is guarded by a huge, barking dog. Unfortunately, you are terrified of dogs! Though the dog is unable to escape its yard, as you walk past you notice yourself breathing more quickly than normal and you can feel your heart racing and your palms sweating. Which of your glands is most likely responsible for your physiological reaction to the dog?
Tap to see back →
The adrenal gland is almost certainly responsible for your reaction, as this gland contains the adrenal medulla, which is capable of releasing epinephrine. During stressful situations, the sympathetic nervous system triggers the fight-or-flight response. During this response, sympathetic nerves stimulate the adrenal medulla, which then releases epinephrine. Epinephrine raises blood sugar levels and increases blood pressure, brain oxygen consumption, and heart rate. It prepares an individual to either fight a threat (such as a dog), or run away from it.
The anterior pituitary is capable of releasing a number of hormones including growth hormone, thyroid-stimulating hormone, and prolactin.
The pineal gland is involved in biorhythms and sleep patterns.
The adrenal cortex is stimulated by adrenocorticotropic hormone and releases corticosteroids in response to long-term stress, such as sleep or food deprivation.
The adrenal gland is almost certainly responsible for your reaction, as this gland contains the adrenal medulla, which is capable of releasing epinephrine. During stressful situations, the sympathetic nervous system triggers the fight-or-flight response. During this response, sympathetic nerves stimulate the adrenal medulla, which then releases epinephrine. Epinephrine raises blood sugar levels and increases blood pressure, brain oxygen consumption, and heart rate. It prepares an individual to either fight a threat (such as a dog), or run away from it.
The anterior pituitary is capable of releasing a number of hormones including growth hormone, thyroid-stimulating hormone, and prolactin.
The pineal gland is involved in biorhythms and sleep patterns.
The adrenal cortex is stimulated by adrenocorticotropic hormone and releases corticosteroids in response to long-term stress, such as sleep or food deprivation.
Which of the following hormones is not released by the anterior pituitary gland?
Which of the following hormones is not released by the anterior pituitary gland?
Tap to see back →
The anterior pituitary is responsible for releasing a large number of hormones; however, oxytocin is released by the posterior pituitary. Two of oxytocin's most important functions include stimulating uterus contractions and stimulating milk production by the mammary glands.
Prolactin stimulates milk release from the mammary glands.
Thyroid-stimulating hormone stimulates the release of hormones from the thyroid gland.
Growth hormone stimulates the growth of bones and stimulates the liver to release insulin-like growth factors.
It is important to note that at least one hormone from the hypothalamus is used to regulate each of the hormones released by the anterior pituitary—for example, the anterior pituitary gland will only release prolactin if the hypothalamus releases prolactin-releasing hormone.
The anterior pituitary is responsible for releasing a large number of hormones; however, oxytocin is released by the posterior pituitary. Two of oxytocin's most important functions include stimulating uterus contractions and stimulating milk production by the mammary glands.
Prolactin stimulates milk release from the mammary glands.
Thyroid-stimulating hormone stimulates the release of hormones from the thyroid gland.
Growth hormone stimulates the growth of bones and stimulates the liver to release insulin-like growth factors.
It is important to note that at least one hormone from the hypothalamus is used to regulate each of the hormones released by the anterior pituitary—for example, the anterior pituitary gland will only release prolactin if the hypothalamus releases prolactin-releasing hormone.
Chemical messengers released in the blood to stimulate or inhibit the function of another organs are known as .
Chemical messengers released in the blood to stimulate or inhibit the function of another organs are known as .
Tap to see back →
A hormone is a chemical formed in one organ and carried by the blood to stimulate or inhibit the function of another organ.
Enzymes are protein molecules that carry out catalytic functions. Electrolytes are simply ions dissolved in solution. Second messengers are relay molecules between a signal and its ultimate effect, such as the molecules that carry signals from the cell membrane to the nucleus to affect transcription. Platelets are cell fragments in the blood that help form clots to heal injuries.
A hormone is a chemical formed in one organ and carried by the blood to stimulate or inhibit the function of another organ.
Enzymes are protein molecules that carry out catalytic functions. Electrolytes are simply ions dissolved in solution. Second messengers are relay molecules between a signal and its ultimate effect, such as the molecules that carry signals from the cell membrane to the nucleus to affect transcription. Platelets are cell fragments in the blood that help form clots to heal injuries.
Which of the following is not true of hormones?
Which of the following is not true of hormones?
Tap to see back →
Hormones are generally slow acting, spread throughout the body by the blood, and can affect a variety of tissues at once. Neurotransmitters on the other hand, are quick acting, localized, and affect only a specific cell. We would not expect hormones to affect only one cell or tissue at a time, as their wide distribution allows them to have multiple target areas.
Hormones are generally slow acting, spread throughout the body by the blood, and can affect a variety of tissues at once. Neurotransmitters on the other hand, are quick acting, localized, and affect only a specific cell. We would not expect hormones to affect only one cell or tissue at a time, as their wide distribution allows them to have multiple target areas.
How do steroid hormones elicit a response from their target cells?
How do steroid hormones elicit a response from their target cells?
Tap to see back →
Steroids are nonpolar, which means that they are able to pass easily through cell membranes, but require a transport protein through the hydrophilic blood in order to do so. The steroid hormone then enters the nucleus and attaches to the DNA in order to increase the desired product at the level of transcription.
Steroids are nonpolar, which means that they are able to pass easily through cell membranes, but require a transport protein through the hydrophilic blood in order to do so. The steroid hormone then enters the nucleus and attaches to the DNA in order to increase the desired product at the level of transcription.
is the hormone responsible for milk production in female mammals. It is released by the .
is the hormone responsible for milk production in female mammals. It is released by the .
Tap to see back →
Prolactin is responsible for the production of milk, while oxytocin is responsible for the ejection of milk. The question asks for the hormone that causes production, so the answer is prolactin. Prolactin is released from the anterior pituitary.
Oxytocin is released from the posterior pituitary and the mammary glands are responsible for releasing milk.
Prolactin is responsible for the production of milk, while oxytocin is responsible for the ejection of milk. The question asks for the hormone that causes production, so the answer is prolactin. Prolactin is released from the anterior pituitary.
Oxytocin is released from the posterior pituitary and the mammary glands are responsible for releasing milk.
Parathyroid hormone (PTH) is a peptide hormone responsible for increasing the concentration of calcium in the blood. This is accomplished by stimulating the activity of osteoclasts and removing calcium from the bones.
If a person has low blood calcium levels, what would you expect the level of PTH to be in the body?
Parathyroid hormone (PTH) is a peptide hormone responsible for increasing the concentration of calcium in the blood. This is accomplished by stimulating the activity of osteoclasts and removing calcium from the bones.
If a person has low blood calcium levels, what would you expect the level of PTH to be in the body?
Tap to see back →
A critical concept to understand about hormones in the body is negative feedback. Remember that hormones are not causing the body's condition, but rather, are responding to the body's condition. As a result, parathyroid hormone would be higher than normal in order to increase the concentration of calcium currently in the blood, correcting the existing deficiency.
A critical concept to understand about hormones in the body is negative feedback. Remember that hormones are not causing the body's condition, but rather, are responding to the body's condition. As a result, parathyroid hormone would be higher than normal in order to increase the concentration of calcium currently in the blood, correcting the existing deficiency.
Which of these hormones is responsible for the secretion of testosterone in males?
Which of these hormones is responsible for the secretion of testosterone in males?
Tap to see back →
Luteinizing hormone is responsible for the secretion of testosterone from leydig cells in the testes.
FSH is responsible for the proliferation of sertoli cells, which nurture sperm cell precursors. hGH is responsible for body growth, and is not responsible for testosterone formation. Oxytocin is responsible for increasing uterine contractions during pregnancy.
Luteinizing hormone is responsible for the secretion of testosterone from leydig cells in the testes.
FSH is responsible for the proliferation of sertoli cells, which nurture sperm cell precursors. hGH is responsible for body growth, and is not responsible for testosterone formation. Oxytocin is responsible for increasing uterine contractions during pregnancy.
is released in response to low blood sugar levels, while is released in response to high blood sugar levels.
is released in response to low blood sugar levels, while is released in response to high blood sugar levels.
Tap to see back →
Insulin is responsible for lowering blood sugar levels, and is therefore released when the body's blood sugar levels are too high. Glucagon is released in response to low blood sugar levels, and acts to increase sugar concentrations.
Thyroid hormones (T3 and T4) are released to increase the body's metabolic rate, but are not directly influenced by blood sugar levels.
Insulin is responsible for lowering blood sugar levels, and is therefore released when the body's blood sugar levels are too high. Glucagon is released in response to low blood sugar levels, and acts to increase sugar concentrations.
Thyroid hormones (T3 and T4) are released to increase the body's metabolic rate, but are not directly influenced by blood sugar levels.
Obesity can sometimes be caused by the slowing of the thyroid gland's production of thyroid hormones III and IV (T3 and T4), a condition known as hypothyroidism. Conversely, hyperthyroidism occurs when the thyroid overproduces T3 and T4. If T3 and T4 receptors became insensitive to the hormones, what effect would this have on the body?
Obesity can sometimes be caused by the slowing of the thyroid gland's production of thyroid hormones III and IV (T3 and T4), a condition known as hypothyroidism. Conversely, hyperthyroidism occurs when the thyroid overproduces T3 and T4. If T3 and T4 receptors became insensitive to the hormones, what effect would this have on the body?
Tap to see back →
The question tells us that slowed output of thyroid hormones can lead to obesity. One can safely assume that receptor insensitivity will have a similar effect. In either scenario, the T3 and T4 hormones are unable to elicit the proper response form the body. Similar to individuals with hypothyroidism, individuals with insensitive receptors would show slowed metabolism and increased weight gain.
The question tells us that slowed output of thyroid hormones can lead to obesity. One can safely assume that receptor insensitivity will have a similar effect. In either scenario, the T3 and T4 hormones are unable to elicit the proper response form the body. Similar to individuals with hypothyroidism, individuals with insensitive receptors would show slowed metabolism and increased weight gain.
is a critical hormone that controls heart rate and constriction of blood vessels. It is crucial in the fight-or-flight response.
is a critical hormone that controls heart rate and constriction of blood vessels. It is crucial in the fight-or-flight response.
Tap to see back →
Epinephrine, released from the adrenal gland, is important for the fight-or-flight response. During moments of stress, heart rate increases, pupils dilate, and blood vessels constrict in order to prepare for danger. All of this is controlled by epinephrine and norepinephrine, and is part of the sympathetic nervous system.
Epinephrine, released from the adrenal gland, is important for the fight-or-flight response. During moments of stress, heart rate increases, pupils dilate, and blood vessels constrict in order to prepare for danger. All of this is controlled by epinephrine and norepinephrine, and is part of the sympathetic nervous system.
, released from the , is the hormone responsible for controlling lactation in nursing women, as well as triggering labor in pregnant women.
, released from the , is the hormone responsible for controlling lactation in nursing women, as well as triggering labor in pregnant women.
Tap to see back →
Oxytocin is responsible for lactation in nursing women. When the nipple is stimulated, oxytocin is released from the posterior pituitary to cause lactation. During labor, release of oxytocin causes positive feedback on the hypothalamus, which causes further oxytocin release.
Luteinizing hormone and follicle-stimulating hormone are released from the anterior pituitary and function to regulate the menstrual cycle. Vasopressin is released from the posterior pituitary and helps to regulate blood pressure and water balance.
Oxytocin is responsible for lactation in nursing women. When the nipple is stimulated, oxytocin is released from the posterior pituitary to cause lactation. During labor, release of oxytocin causes positive feedback on the hypothalamus, which causes further oxytocin release.
Luteinizing hormone and follicle-stimulating hormone are released from the anterior pituitary and function to regulate the menstrual cycle. Vasopressin is released from the posterior pituitary and helps to regulate blood pressure and water balance.
Which steroid hormone is responsible for development of the secondary sexual characteristics in males, such as facial hair and deepening of the voice?
Which steroid hormone is responsible for development of the secondary sexual characteristics in males, such as facial hair and deepening of the voice?
Tap to see back →
Testosterone is well known to be responsible for male secondary sexual characteristics. It also plays a key role in behavior, such as aggression. For example, during mating season in gorillas the testosterone levels in males raise significantly and lead to confrontations between males.
Progesterone and estrogen are responsible for female secondary sexual characteristics, while cortisol plays a role in the body's response to long-term stress.
Testosterone is well known to be responsible for male secondary sexual characteristics. It also plays a key role in behavior, such as aggression. For example, during mating season in gorillas the testosterone levels in males raise significantly and lead to confrontations between males.
Progesterone and estrogen are responsible for female secondary sexual characteristics, while cortisol plays a role in the body's response to long-term stress.
A certain molecule is known to signal through an autocrine mechanism. What does this tell us about the hormone's behavior?
A certain molecule is known to signal through an autocrine mechanism. What does this tell us about the hormone's behavior?
Tap to see back →
To answer this question, you must have an understanding of the differences between endocrine, paracrine, and autocrine functioning. This example, in which a molecule exhibits autocrine behavior, means that a cell releases a hormone that acts on itself. In paracrine signaling, the molecule does not act on the same cell, but does diffuse through tissue to reach nearby target cells. Finally, endocrine signaling refers to hormone molecules that are released and transported through the bloodstream to act on more faraway target cells in distant regions.
To answer this question, you must have an understanding of the differences between endocrine, paracrine, and autocrine functioning. This example, in which a molecule exhibits autocrine behavior, means that a cell releases a hormone that acts on itself. In paracrine signaling, the molecule does not act on the same cell, but does diffuse through tissue to reach nearby target cells. Finally, endocrine signaling refers to hormone molecules that are released and transported through the bloodstream to act on more faraway target cells in distant regions.
Which hormone is most likely to be produced in order to decrease plasma calcium levels?
Which hormone is most likely to be produced in order to decrease plasma calcium levels?
Tap to see back →
The two hormones known for their effect on plasma calcium levels are calcitonin and parathyroid hormone (PTH). When calcium levels are high, calcitonin is released by the thyroid gland to stimulate the uptake of serum calcium into bone. This effectively decreases calcium levels in the blood. PTH has the opposite effect and is released by the parathyroid gland.
The three remaining answer choices are not known for their effect on calcium levels in the blood.
The two hormones known for their effect on plasma calcium levels are calcitonin and parathyroid hormone (PTH). When calcium levels are high, calcitonin is released by the thyroid gland to stimulate the uptake of serum calcium into bone. This effectively decreases calcium levels in the blood. PTH has the opposite effect and is released by the parathyroid gland.
The three remaining answer choices are not known for their effect on calcium levels in the blood.
The major tropic action of the growth hormone is to signal the to release .
The major tropic action of the growth hormone is to signal the to release .
Tap to see back →
Growth hormone is released from the anterior pituitary, and has numerous effects on the body. One of its primary effects is to stimulate release of insulin-like growth factors (IGFs) from the liver. These compounds circulate in the blood and directly stimulate bone and cartilage growth.
The release of thyroid-stimulating hormone (TSH) causes the release of T3 and T4, which help speed up metabolism. Glucagon serves to increase blood glucose level. Epinephrine is released in response to short term stress, and stimulates the sympathetic nervous system.
Growth hormone is released from the anterior pituitary, and has numerous effects on the body. One of its primary effects is to stimulate release of insulin-like growth factors (IGFs) from the liver. These compounds circulate in the blood and directly stimulate bone and cartilage growth.
The release of thyroid-stimulating hormone (TSH) causes the release of T3 and T4, which help speed up metabolism. Glucagon serves to increase blood glucose level. Epinephrine is released in response to short term stress, and stimulates the sympathetic nervous system.