export_male role in repro

Question 1

Describe the Acrosomal reaction

Answer 1

• sperm binds to zp3
• leads to ca2+ influx into sperm
• acr. membrane disappears, contents released
• digests hole in zp
• chromatin de-condense

Question 2

What is the seminal plasma?

Answer 2

• nutrients for sperm

* immunosuppof female Imm System

Question 3

How long does spermatogenesis take in Bull/Dog?

Answer 3

61d

Question 4

Spermatogenesis in a stallion?

Answer 4

57d

Question 5

How many cycles does it take on average until sperm mature?

Answer 5

5 (10d each)

Question 6

What is the order of tubes the sperm travels down after being released into seminiferous tubule?

Answer 6

• Seminif
• straight tubule
• rete testis
• eff ductule
• tail of epididymus
• vas deferens

Question 7

What cells form the sperm-testes barrier?

Answer 7

sertoli cells

Question 8

What do Leydig cells produce?

Answer 8

androgens, primarily testosterone

Question 9

What stimulates Testosterone release from Leydig cells?

Answer 9

LH

Question 10

FSH stimulates Sertoli cells to produce…

Answer 10

Inhibin:
- stim spermatogenesis

• inhibits GnRH and FSH
• inc androgenesis by leydig

Question 11

Why is the blood testis barrier necessary

Answer 11

Haploid cells are considered foreign by male immune syste,

Question 12

Where does the sperm mature?

Answer 12

Tail of epid

Question 13

Sperm consistency doesnt change after leaving the testis, except in what animal?

Answer 13

Stallion

Question 14

What vascular changes happen during an erection?

Answer 14

• circumflex v contracts
• corporal sinusoids dil
• tunica albuginea narrows
• retractor peni m relaxes
• PS-NS NANC ensure vasodil AND smooth m tone (=hard)

Question 15

What 3 muscles contract to ejaculate

Answer 15

1. urethralis
   2, ischiocavernosus m
2. bulbospongiosus

Question 16

Capacitation

Answer 16

= Process that enables a spermatozoa to penetrate an egg

by removal of seminal plasma to show ZP3 receptors