26.3 Physiology of the Male Repro Sytem Flashcards
___________ is the process of sperm cell development that occurs in the ___________of the testes. The end result is four total haploid spermatids.
___________ is the maturation of spermatids into motile sperm cells. It occurs in the___________. Both processes begin at puberty and continue throughout life.
Spermatogenesis is the process of sperm cell development that occurs in the seminiferous tubules of the testes. The end result is four total haploid spermatids.
Spermiogenesis is the maturation of spermatids into motile sperm cells. It occurs in the epididymis. Both processes begin at puberty and continue throughout life.
Testosterone secretion and spermatogenesis are controlled by the ____________ axis.
Testosterone secretion and spermatogenesis are controlled by the hypothalamic-pituitary-gonadal (HPG) axis.
The hypothalamus releases gonadotropin-releasing hormone (GnRH), which stimulates the anterior pituitary to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
The hypothalamus releases gonadotropin-releasing hormone (GnRH), which stimulates the anterior pituitary to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
_____________ stimulates__________to produce testosterone, which stimulates spermatogenesis; maturation of sex organs; development of secondary sex characteristics; and anabolic effects, including bone growth and increased muscle mass.
FSH stimulates sustentacular cells to secrete androgen-binding protein (ABP) and inhibin.
Luteinizing hormone (LH) stimulates interstitial cells to produce testosterone, which stimulates spermatogenesis; maturation of sex organs; development of secondary sex characteristics; and anabolic effects, including bone growth and increased muscle mass.
_______ stimulates sustentacular cells to secrete androgen-binding protein (ABP) and inhibin.
FSH stimulates sustentacular cells to secrete androgen-binding protein (ABP) and inhibin.
FSH stimulates _________ to secrete _________ and _________ .
FSH stimulates sustentacular cells to secrete androgen-binding protein (ABP) and inhibin.
Puberty in boys usually begins between the ages of ___ and ___, when _____ and so the testosterone levels begin to rise.
Puberty in boys usually begins between the ages of 12 and 14, when GnRH and so the testosterone levels begin to rise.
Male secondary sex characteristics include
- pubic, axillary, and facial hair;
- deeper voice;
- thicker skin;
- increased bone density;
- larger skeletal muscles;
- increased BMR and RBC (basal metabolic rate and red blood cell count);
- and increased volume of body fluids.
Which of the following is the main hormone that regulates spermatogenesis?
inhibin
estrogen
testosterone
growth hormone
Which of the following is the main hormone that regulates spermatogenesis?
inhibin
estrogen
testosterone
growth hormone
Decline in male reproductive functions occur during:
puberty
menopause
menarche
andropause
Decline in male reproductive functions occur during:
puberty
menopause
menarche
andropause
How many spermatids result from one spermatogonium?
2
4
8
16
How many spermatids result from one spermatogonium?
2
4
8
16
What stem cell begins the process of spermatogenesis?
spermatid
spermatogonium
primary spermatocyte
secondary spermatocyte
What stem cell begins the process of spermatogenesis?
spermatid
spermatogonium
primary spermatocyte
secondary spermatocyte
What is the maturation process in which spermatids elongate and shed excess cytoplasm?
meiosis I
meiosis II
spermiogenesis
spermatogenesis
What is the maturation process in which spermatids elongate and shed excess cytoplasm?
meiosis I
meiosis II
spermiogenesis
spermatogenesis
The movement of sperm, testicular fluids, and secretions from the prostate gland and seminal vesicle into the urethra is known as:
emission.
expulsion.
ejaculation.
erection.
The movement of sperm, testicular fluids, and secretions from the prostate gland and seminal vesicle into the urethra is known as:
emission.
expulsion.
ejaculation.
erection.
A male bodybuilder takes testosterone supplements to increase his muscle mass. After three weeks, which of the following do you expect to observe?
Excess testosterone inhibits production of growth hormone-releasing hormone (GHRH).
Excess testosterone inhibits production of gonadotropin-releasing hormone (GnRH).
Excess testosterone increases production of luteinizing hormone (LH).
Excess testosterone increases production of estrogens.
A male bodybuilder takes testosterone supplements to increase his muscle mass. After three weeks, which of the following do you expect to observe?
Excess testosterone inhibits production of growth hormone-releasing hormone (GHRH).
Excess testosterone inhibits production of gonadotropin-releasing hormone (GnRH).
Excess testosterone increases production of luteinizing hormone (LH).
Excess testosterone increases production of estrogens.
