Reproductive Physiology

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Anatomy › Reproductive Physiology

Questions 1 - 10
1

Which male reproductive structure is responsible for the storage of sperm cells?

Epididymis

Seminiferous tubules

Vas deferens

Prostate gland

Explanation

After developing in the seminiferous tubules, sperm cells are transferred to the epididymis in order to be stored prior to ejaculation. The sperm cells also mature further and develop the ability to swim in the epididymis.

The vas deferens is the duct connecting the epididymis to the ejaculatory ducts. The prostate gland, bulbourethral gland, and seminal vesicles produce alkaline and lubricating fluids for the composition of semen.

2

Which male reproductive structure is responsible for the storage of sperm cells?

Epididymis

Seminiferous tubules

Vas deferens

Prostate gland

Explanation

After developing in the seminiferous tubules, sperm cells are transferred to the epididymis in order to be stored prior to ejaculation. The sperm cells also mature further and develop the ability to swim in the epididymis.

The vas deferens is the duct connecting the epididymis to the ejaculatory ducts. The prostate gland, bulbourethral gland, and seminal vesicles produce alkaline and lubricating fluids for the composition of semen.

3

What is the purpose of human chorionic gonadotropin (hCG) in the female body?

Maintains the corpus luteum

Causes ovulation

Causes menstruation

Maintains the placenta

Stimulate the corpus albicans

Explanation

Human chorionic gonadotropin is a peptide hormone that helps prevent the breakdown of the corpus luteum. This allows the corpus luteum to continue secreting progesterone and estrogen during implantation. As the placenta forms, it eventually takes over the job of secreting hormones for the corpus luteum. The corpus luteum is only preserved when fertilization has occurred; normally, the structure devolves into the corpus albicans. Human chorionic gonadotropin can thus be used to detect pregnancy, as it is only secreted after fertilization.

4

What is the purpose of human chorionic gonadotropin (hCG) in the female body?

Maintains the corpus luteum

Causes ovulation

Causes menstruation

Maintains the placenta

Stimulate the corpus albicans

Explanation

Human chorionic gonadotropin is a peptide hormone that helps prevent the breakdown of the corpus luteum. This allows the corpus luteum to continue secreting progesterone and estrogen during implantation. As the placenta forms, it eventually takes over the job of secreting hormones for the corpus luteum. The corpus luteum is only preserved when fertilization has occurred; normally, the structure devolves into the corpus albicans. Human chorionic gonadotropin can thus be used to detect pregnancy, as it is only secreted after fertilization.

5

Fertilization typically takes place in which location?

Fallopian tube

Uterus

Ovary

Vagina

Explanation

The most common location for the fertilization of the egg is the fallopian tube. The zygote then undergoes several divisions and some development before implanting in the endometrium of the uterus as a blastocyst. Abnormal implantation can occur while the blastocyst is still in the fallopian tube, resulting in an ectopic pregnancy. This event generally requires surgery to rectify and can be extremely dangerous to the mother and developing embryo.

6

A spike in the concentration of which of the following hormones stimulates ovulation in females?

Luteinizing hormone

Follicle-stimulating hormone

Estrogen

Progesterone

Testosterone

Explanation

A spike in the concentration of luteinizing hormone (LH) leads to ovulation on day 14 of the menstrual cycle. This spike is known as the "LH surge" and is initiated by a positive feedback mechanism involving estrogen.

Follicle-stimulating hormone (FSH) is involved in the maturation of the follicle, but not ovulation. Progesterone functions in maintaining the endometrial tissue after implantation has occurred. Testosterone is not involved in the female reproductive cycle.

7

Fertilization typically takes place in which location?

Fallopian tube

Uterus

Ovary

Vagina

Explanation

The most common location for the fertilization of the egg is the fallopian tube. The zygote then undergoes several divisions and some development before implanting in the endometrium of the uterus as a blastocyst. Abnormal implantation can occur while the blastocyst is still in the fallopian tube, resulting in an ectopic pregnancy. This event generally requires surgery to rectify and can be extremely dangerous to the mother and developing embryo.

8

A spike in the concentration of which of the following hormones stimulates ovulation in females?

Luteinizing hormone

Follicle-stimulating hormone

Estrogen

Progesterone

Testosterone

Explanation

A spike in the concentration of luteinizing hormone (LH) leads to ovulation on day 14 of the menstrual cycle. This spike is known as the "LH surge" and is initiated by a positive feedback mechanism involving estrogen.

Follicle-stimulating hormone (FSH) is involved in the maturation of the follicle, but not ovulation. Progesterone functions in maintaining the endometrial tissue after implantation has occurred. Testosterone is not involved in the female reproductive cycle.

9

Which of these structures functions in the maturation and storage of sperm?

Epididymis

Ejaculatory duct

Testis

Seminal vesicles

Explanation

The epididymis is an anatomical structure in the male reproductive system. It functions in the maturation and storage of spermatozoa and in propulsion of the spermatozoa into the vas deferens. The ejaculatory duct is responsible for propelling spermatozoa with seminal fluid into the urethra. The testis is responsible for producing spermatozoa and secreting the sex hormones. Lastly, the seminal vesicles are responsible for producing the alkaline component of seminal fluid.

10

What is the function of human chorionic gonadotropin (hCG)?

Stimulates the corpus luteum to make progesterone

Stimulates estrogen release

Thickens endometrial lining during the proliferative phase and releases luteinizing on the 14th day of the cycle

Stimulates formation of the corpus luteum

Stimulates testosterone release from interstitial cells

Explanation

Follicle-stimulating hormone (FSH) stimulates the release of estrogen. Estrogen then thickens the endometrial lining during the proliferative phase and stimulates the release of luteinizing hormone (LH) on the 14th day of the cycle. This causes the luteal surge that results in the development of the corpus luteum.

Testosterone release is triggered by luteinizing hormone during spermatogenesis, which does not occur in females.

Human chorionic gonadotropin is used by over-the-counter pregnancy tests to detect fertilization and is secreted after fertilization occurs to maintain high levels of progesterone. When fertilization occurs, progesterone causes a pause in the menstrual cycle; follicle-stimulating hormone will only trigger the estrogen spike if progesterone levels decline enough. With progesterone levels elevated, the corpus luteum is maintained rather than transitioning into the corpus albicans.

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