Digestive System
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AP Biology › Digestive System
One of the functions of the liver is __________.
to produce bile, triglycerides, and cholesterol
to act as the main storage center for bile
to secrete epinephrine and norepinephrine
to physically digest food
to produce insulin in its specialized beta cells
Explanation
The liver has a large number of functions, including metabolizing toxins, synthesizing proteins, and storing glucose in the form of glycogen. The only answer choice that describes liver functions is the production of bile, triglycerides, and cholesterol.
The pancreas produces insulin from beta cells, the gall bladder stores bile, and the adrenal medulla secretes epinephrine and norepinephrine. Physical digestion takes place mainly in the mouth and stomach, not the liver.
Why are villi found in the small intestine, but not in the stomach?
The small intestine uses the villi to increase its surface area and facilitate absorption. Absorption does not occur in the stomach.
The small intestine uses villi to adhere to the food particles entering from the stomach, while the stomach has no need for such adhesion.
The villi allow multiple areas where digestive enzymes can be released by the small intestine. The stomach does not release digestive enzymes.
The villi act in a cilia-like motion and move food down the small intestine. Movement in the stomach is generated by smooth muscle contractions.
Explanation
The villi are helpful in increasing the surface area of the small intestine. This greatly increases the absorptive capabilities of the small intestine. The stomach has no villi, and does not contribute to absorption of macromolecules.
Why are villi found in the small intestine, but not in the stomach?
The small intestine uses the villi to increase its surface area and facilitate absorption. Absorption does not occur in the stomach.
The small intestine uses villi to adhere to the food particles entering from the stomach, while the stomach has no need for such adhesion.
The villi allow multiple areas where digestive enzymes can be released by the small intestine. The stomach does not release digestive enzymes.
The villi act in a cilia-like motion and move food down the small intestine. Movement in the stomach is generated by smooth muscle contractions.
Explanation
The villi are helpful in increasing the surface area of the small intestine. This greatly increases the absorptive capabilities of the small intestine. The stomach has no villi, and does not contribute to absorption of macromolecules.
Why are villi found in the small intestine, but not in the stomach?
The small intestine uses the villi to increase its surface area and facilitate absorption. Absorption does not occur in the stomach.
The small intestine uses villi to adhere to the food particles entering from the stomach, while the stomach has no need for such adhesion.
The villi allow multiple areas where digestive enzymes can be released by the small intestine. The stomach does not release digestive enzymes.
The villi act in a cilia-like motion and move food down the small intestine. Movement in the stomach is generated by smooth muscle contractions.
Explanation
The villi are helpful in increasing the surface area of the small intestine. This greatly increases the absorptive capabilities of the small intestine. The stomach has no villi, and does not contribute to absorption of macromolecules.
One of the functions of the liver is __________.
to produce bile, triglycerides, and cholesterol
to act as the main storage center for bile
to secrete epinephrine and norepinephrine
to physically digest food
to produce insulin in its specialized beta cells
Explanation
The liver has a large number of functions, including metabolizing toxins, synthesizing proteins, and storing glucose in the form of glycogen. The only answer choice that describes liver functions is the production of bile, triglycerides, and cholesterol.
The pancreas produces insulin from beta cells, the gall bladder stores bile, and the adrenal medulla secretes epinephrine and norepinephrine. Physical digestion takes place mainly in the mouth and stomach, not the liver.
One of the functions of the liver is __________.
to produce bile, triglycerides, and cholesterol
to act as the main storage center for bile
to secrete epinephrine and norepinephrine
to physically digest food
to produce insulin in its specialized beta cells
Explanation
The liver has a large number of functions, including metabolizing toxins, synthesizing proteins, and storing glucose in the form of glycogen. The only answer choice that describes liver functions is the production of bile, triglycerides, and cholesterol.
The pancreas produces insulin from beta cells, the gall bladder stores bile, and the adrenal medulla secretes epinephrine and norepinephrine. Physical digestion takes place mainly in the mouth and stomach, not the liver.
What is the correct order that a bolus of food will pass through the small intestine?
Duodenum, jejunum, ileum
Ileum, duodenum, jejunum
Duodenum, ileum, jejunum
Jejunum, ileum, duodenum
Jejunum, duodenum, ileum
Explanation
The correct order that the food will pass as is first the duodenum, then the jejunum and finally the ileum. These are all sections or portions of the small intestine, the organ responsible for the vast majority of absorption of nutrients from food before it is passed on to the large intestine, where water, vitamins, minerals, and any other remaining nutrients are absorbed into the body.
What is the correct order that a bolus of food will pass through the small intestine?
Duodenum, jejunum, ileum
Ileum, duodenum, jejunum
Duodenum, ileum, jejunum
Jejunum, ileum, duodenum
Jejunum, duodenum, ileum
Explanation
The correct order that the food will pass as is first the duodenum, then the jejunum and finally the ileum. These are all sections or portions of the small intestine, the organ responsible for the vast majority of absorption of nutrients from food before it is passed on to the large intestine, where water, vitamins, minerals, and any other remaining nutrients are absorbed into the body.
What is the correct order that a bolus of food will pass through the small intestine?
Duodenum, jejunum, ileum
Ileum, duodenum, jejunum
Duodenum, ileum, jejunum
Jejunum, ileum, duodenum
Jejunum, duodenum, ileum
Explanation
The correct order that the food will pass as is first the duodenum, then the jejunum and finally the ileum. These are all sections or portions of the small intestine, the organ responsible for the vast majority of absorption of nutrients from food before it is passed on to the large intestine, where water, vitamins, minerals, and any other remaining nutrients are absorbed into the body.
Bile salts make fat droplets more accessible to the enzyme __________.
pancreatic lipase
trypsin
chymotrypsin
pepsin
lingual lipase
Explanation
Once large fat clusters are broken down by bile salts to become smaller micelles, pancreatic lipase has more surface area to access fats. The enzymes are able to reach the fat droplet through the gaps between bile salts. Fats are not emulsified by bile yet in the mouth, so lingual lipase acts upstream of bile to hydrolize long chain hydrocarbons. The other answer choices are proteases.