NCLEX : Reproductive Physiology

Study concepts, example questions & explanations for NCLEX

varsity tutors app store varsity tutors android store

Example Questions

Example Question #11 : Reproductive Physiology

Which of the following is a normal value for luteinizing hormone (LH) in an adult male?

Possible Answers:

Correct answer:

Explanation:

Normal LH values for an adult male range from . These can be slightly lower in pre-pubescent males. Adult levels above  can be seen in certain conditions of gonadal dysfunction, such as hypogonadism.

Example Question #52 : General Biology

What is the function of luteinizing hormone (LH) in an adult male?

Possible Answers:

It triggers sperm production in the seminiferous tubules

It triggers the production of testosterone by the Sertoli cells of the testes

It triggers the conversion of testosterone into dihydrotestosterone

It triggers the production of testosterone by the Leydig cells in the testes

Correct answer:

It triggers the production of testosterone by the Leydig cells in the testes

Explanation:

In an adult male, luteinizing hormone triggers the production of testosterone by the Leydig (interstitial) cells in the testes. Testosterone is converted to DHT (dihydrotestosterone) by the enzyme 5-alpha reductase. Sperm production and maturation is triggered by follicle-stimulating hormone (FSH) rather than LH in adult males.

Example Question #61 : General Biology

Which of the following is the most biologically active form of estrogen?

Possible Answers:

Estrone

Estriol

Progesterone

Estradiol

Correct answer:

Estradiol

Explanation:

The most prevalent and biologically active estrogen in an adult female is estradiol (E2). Estrone and estriol are less active forms of estrogen, and progesterone is not a form of estrogen, but rather a distinct progestogen reproductive hormone.  

Example Question #61 : General Biology

What is the most prevalent form of circulating estrogen in a post-menopausal female?

Possible Answers:

Estradiol

Estrone

Estetrol

Estriol

Correct answer:

Estrone

Explanation:

After menopause, the most predominant form of circulating estrogen is estrone (E1). Estradiol is more prevalent in pre-menopausal women who are not pregnant, while estriol and estetrol are both only elevated during pregnancy.

Example Question #363 : Nclex

What form of estrogen is only present in pregnant females?

Possible Answers:

Estetrol (E4)

Estrone (E1)

Estriol (E3)

Estradiol (E2)

Correct answer:

Estetrol (E4)

Explanation:

The only form of estrogen that is exclusively present in pregnant women is estetrol (E4). 

Example Question #11 : Reproductive Physiology

What enzyme is responsible for the conversion of androgens into estrogen?

Possible Answers:

5-alpha-reductase

Protease

Aromatase

Amylase

Correct answer:

Aromatase

Explanation:

The conversion of androgens into estrogen is performed by aromatase, also known as estrogen synthetase or estrogen synthase. 5-alpha-reductase is responsible for the conversion of testosterone to dihydrotestosterone. Amylase is a salivary enzyme that breaks down starches during mastication, and protease is a digestive enzyme that aids in the breakdown of proteins.

Example Question #62 : Other General Biology

Which cells in the male reproductive tract produce testosterone?

Possible Answers:

Sertoli cells

Spermatogenic cells

Leydig cells

Wolffian cells

Correct answer:

Leydig cells

Explanation:

Leydig cells, located in the testes adjacent to the seminiferous tubules, secrete testosterone in response to lutenizing hormone (LH). Sertoli cells are also adjacent to the seminiferous tubules. They play a role in stimulating spermatogenesis in spermatogenic cells. Wolffian cells are a part of the fetal male reproductive tract and do not produce testosterone. 

Example Question #371 : Nclex

Which of the following structures are formed from the embryological Wolffian ducts?

Possible Answers:

The vas deferens

All of these are correct

The seminal vesicles

The epididymis

Correct answer:

All of these are correct

Explanation:

The Wolffian ducts are fetal urogenital structures that develop into the seminal vesicles, the vas deferens, and the epididymis. They also form parts of the bladder wall.

Example Question #372 : Nclex

Which of the following is not an androgen?

Possible Answers:

Dihydrotestosterone 

Androstenedione

Dehydroepiandrosterone (DHEA)

2-Hydroxyestrone

Correct answer:

2-Hydroxyestrone

Explanation:

All of the hormones listed, and testosterone, are androgens except 2-hydroxyestrone, which is a metabolite of estrone (a form of estrogen).

Example Question #373 : Nclex

Androstenedione is produced by all of the following tissues except __________.

Possible Answers:

The testes

The ovaries

The adrenal cortex

The adrenal medulla

Correct answer:

The adrenal medulla

Explanation:

Androstenedione is produced by the ovaries, the testes, and the adrenal cortex. The adrenal medulla primarily secretes epinephrine and norepinephrine.

Learning Tools by Varsity Tutors