Male Repro

Question 1

What function does the epididymis have?

Answer 1

Storage, maturation, transport of sperm.

Sperm becomes fully motile after travelling through epididymis.

Maintains inactivity through H+ production.

Question 2

What function does the Vas deferens have?

Answer 2

Sperm transport and has an enlarged ampulla for storage.

Question 3

What does the seminal vesicle produce?

Answer 3

60% of fluid in semen
Fructose
Prostaglandins for cervix.
Fibrinogen for coagulation
Seminogelin - suppresses motility of coagulated sperm.

Question 4

What function does the prostate have?

Answer 4

Secretes milky white fluid:
Prostatic acid phosphatase
Profibrinolysin (dissolved coagulated sperm)
HCO3 which neutralized acidic cervix.
PSA hydrolyzes seminogelin increasing sperm motility

Converts 90% testosterone to DHT by 5 alpha reductase to regulate prostate growth.

Question 5

What does 5alpha-reductase do and where is it produced?

Answer 5

Produced by the prostate converting 90% of testosterone into DHT for regulation of prostate growth.

Question 6

What does the bulbourethral gland do?

Answer 6

Secretes lubricative mucus into the vagina.

Question 7

What function does LH hormone have on the testes?

Answer 7

Acts on the Leydig cells by upregulated cholesterol desmolase to produce pregnenolone which is ultimately formed into testosterone.

Question 8

What does Testosterone do in the testes?

Answer 8

Testosterone difuses into the sertolli cells where it will fascilitate spermatogenesis.

Question 9

What can testosterone be converted to and by what enzymes?

Answer 9

Estradiol by aromatase

DHT in the prostate by 5alpha-reductase.

Question 10

What provides feedback to arcuate nucleus producing GnRH?

Answer 10

Inhibited by testosterone, Estradiole, and DHT.

Testosterone inhibits GnRH release as well as LH release.

Question 11

What function does FSH serve?

Answer 11

Activates sertoli cells to fascilitate spermatogenesis.

Upregulates Androgen binding protein = localizes test. for spermatogenesis.

Increases growth of Leydig cells.

Produces and secretes inhibin that inhibits FSH secretion.

Question 12

What specifically inhibits the release of FSH and LH?

Answer 12

FSH is inhibited by inhibin made by sertoli cells.

LH is inhibited by Testosterone made in the Leydig cells.

Question 13

what is spermatogenesis?

Answer 13

The response of GnRH leading to increased testosterone.

This leads to the two meitotic devisions leading to the formation of sperm.

Question 14

What is spermiation?

Answer 14

The transfer of spermatazoa (Sperm) into the seminiferous lumen.

Question 15

What is spermiogenesis?

Answer 15

The differentiation of spermatids into actual sperm through elongation and addition of the acrosomal cap.

Question 16

What processes must occur for erection to happen?

Answer 16

Parasympathetic induced acetylcholine release leading to increased nitric oxide and vasoactive intestinal peptide (VIP) production.

NO causes the Corpi to become flooded and venous system to be clamped off leading to erection.

Question 17

How is an erection let back down?

Answer 17

Sympathetic nerve arterial constriction.

cGMP broken down by phosphodiesterases inhibiting dilation

Question 18

What part of the nervous system is responsible for lubrication?

Answer 18

Parasympathetic impulses cause the bulbourethral glands to secrete mucus.

Question 19

What nervous system part is responsible for emmision of sperm?

Answer 19

Sympathetics induce the ampullary portion of the vas deferens to release sperm, close internal bladder.

Emission precedes and coincides with ejaculation.

Question 20

What nervous system part is responsible for ejaculation?

Answer 20

Reflex reaction from emission of semen into proximal urethra reaching sacral spinal cord.

Pudendal nerve causes rhymic contraction.