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Physiology Exam IV > Male Reproductive System > Flashcards

Male Reproductive System Flashcards

1
Q

Function of epididymis

A

maturation of sperm, secretes H to acidify luminal fluid, storage, reabsorption

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2
Q

Function of vas deferns

A

stoarge, transportation of sperm

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3
Q

function of seminal vescle

A

secrete/store fructose semen, PG, ascorbic acid, fibrinogen, thrombin-like protins

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4
Q

function of prostate

A

secrete/store fluid rich in PSA

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5
Q

functino of bulbourethral gland

A

secrete mucous upon arousal

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6
Q

what is GnRH released by

A

hypothalmus

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7
Q

function of GnRH

A

releases LH and RSH

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8
Q

what is LH released by

A

ant. put

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9
Q

function of LH

A

binds to leydig cell receptors, stimulates testosterone proudction and secretion

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10
Q

function of FSH

A

stimulates sertoli cells to produce ABP and inhibin. Controls sertoli cell proliferatino and seminiferous tubule growth

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11
Q

affect of testosterone on other hormones

A

neg. feedback on GnRH and LH RSH

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12
Q

function of androgen binding protein

A

concentrates testosterone at site of spermatogensis

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13
Q

inhibin B

A

selectively inhibits FSH production

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14
Q

what does inhibit give neg feedback on

A

FSH

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15
Q

what can testosterone be converted to

A

SHT and estradiol

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16
Q

____ binds to receptors on leydig cells

A

LH

17
Q

what happens when LH binds to receptors on leydig cells

A

increases intracellular cAMP and steroidogenic enzymes like cholesterol side chain cleavage enzyme, converting cholesterole into pregnenolone

18
Q

the enzymes 3beta-HSD and 17beta-HSD convert pregnenolone into what

A

testosterone

19
Q

Testosterone gets converted to ____ by 5 alpha reductase

A

DHT

20
Q

Testerstone diffuses to sertoli cells then what

A

stimulates speramotgensis

21
Q

PSH acts on what cells

A

sertoli

22
Q

what happens when PSH acts on sertoli cells

A

induces synth/secretion of androgen binding protein (ABP) which facilitates spermatogenesis by concentrating testosterone in the Sertoli cells.

23
Q

function of testosterone

A

internal genitalia development during gestation, skeletal muscle mass/strength in puberty, erythropoiesis

24
Q

function of dihydrotestosterone

A

differentiation/maturation of external genitalia. Adult prostatic disease. Increased hair follicle growth during puberty

25
Q

function of etradiol

A

acts on estrogen receptor, increases bone density and epiphyseal closure, libido

26
Q

Spermatogenesis

A

Spermatogonia stem cells begin dividing at puberty, some remain spermatogonia and some become primary spermatocytes

27
Q

primary spermatocytes form what

A

secondary speratocytes then speratids then spermatozoa

28
Q

spermiogensis

A

spermatids changing into spermatozoa (controlled by FSH)

29
Q

spermiation

A

release of mature sperm into lumen

30
Q

examples of primary male hypogonadism

A

testicular dysfunction, decrease in testosterone. Cryptorchidism, Klinefelter syndrome (extra X)

31
Q

examples of secondary male hypogonadism

A

Hypothalamus/pituitary dysfunction, decrease in gonadotropins. Low testosterone due to low LH/FSH. Kallmann syndrome

32
Q

What are the stages of the male sexual act

A

erection
lubrication
emission
ejaculation

33
Q

erection

A

parasymp

dilation of penile arteries

34
Q

lubrication

A

parasymp

bulbourethral gland secretion

35
Q

emmsion

A

symp
Ampulla of vas deferens contracts moving spermatozoa into proximal urethra. Contraction of seminal vesicles and prostate. Internal bladder sphincter contracts. Precedes/coincides w/ ejaculation

36
Q

ejaculation

A

spinal reflex triggered by entry of semen into proximal urethra. Afferent impulses to sacral spinal cord, somatic motor efferents cause rhythmic contraction of muscles at base of penis and pelvic floor

37
Q

what happens during an erection

A

Parasymp nerves induce vascular smooth muscle relaxation in penile arterioles through release of acetylcholine, NO, and vasoactive intestinal peptide -> vasodilation and engorgement of corpus cavernosum and corpus spongiosum. Veins compressed

38
Q

what terminates an erection

A

sympathetic nerve impuses causing vasoconstriction

Physiology Exam IV (16 decks)

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