NCLEX : Reproductive Physiology
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Example Question #11 : Reproductive Physiology
Which of the following is a normal value for luteinizing hormone (LH) in an adult male?
Normal LH values for an adult male range from 
Example Question #361 : Nclex
What is the function of luteinizing hormone (LH) in an adult male?
It triggers sperm production in the seminiferous tubules
It triggers the production of testosterone by the Leydig cells in the testes
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
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?
Estriol
Progesterone
Estradiol
Estrone
Estradiol
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 : Other General Biology
What is the most prevalent form of circulating estrogen in a post-menopausal female?
Estriol
Estradiol
Estetrol
Estrone
Estrone
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 #63 : General Biology
What form of estrogen is only present in pregnant females?
Estriol (E3)
Estetrol (E4)
Estrone (E1)
Estradiol (E2)
Estetrol (E4)
The only form of estrogen that is exclusively present in pregnant women is estetrol (E4).
Example Question #362 : Nclex
What enzyme is responsible for the conversion of androgens into estrogen?
Protease
Amylase
5-alpha-reductase
Aromatase
Aromatase
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 #14 : Reproductive Physiology
Which cells in the male reproductive tract produce testosterone?
Wolffian cells
Leydig cells
Spermatogenic cells
Sertoli cells
Leydig cells
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 #63 : General Biology
Which of the following structures are formed from the embryological Wolffian ducts?
All of these are correct
The vas deferens
The seminal vesicles
The epididymis
All of these are correct
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 #371 : Nclex
Which of the following is not an androgen?
Dehydroepiandrosterone (DHEA)
2-Hydroxyestrone
Androstenedione
Dihydrotestosterone
2-Hydroxyestrone
All of the hormones listed, and testosterone, are androgens except 2-hydroxyestrone, which is a metabolite of estrone (a form of estrogen).
Example Question #68 : General Biology
Androstenedione is produced by all of the following tissues except __________.
The adrenal medulla
The adrenal cortex
The ovaries
The testes
The adrenal medulla
Androstenedione is produced by the ovaries, the testes, and the adrenal cortex. The adrenal medulla primarily secretes epinephrine and norepinephrine.
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