Male Reproductive Physiology

Question 1

Countercurrent health exchange

Answer 1

Constant testicular temperature

Cools arterial blood with venous blood

Pamniform plexus

Question 2

What factors affect testicle temperature

Answer 2

(Need to be less than body)
Hyperthermia

Mumps

Viral infection

Question 3

Endocrine factors affecting spermatogenesis

Answer 3

Anabolic steroids

Reduction in gonadotropin sand androgens

Question 4

Environmental factors affecting spermatogenesis

Answer 4

Occupation - car industry, welding, plastic manufacture

Radiation

Smoking
Alcohol

Question 5

Medicines affecting spermatogenesis

Answer 5

Some anti-hypertensives

Some anti-depressants

Question 6

Where is sperm produced

Answer 6

Seminiferous tubules

Question 7

Where is inhibit B secreted

Answer 7

Sertoli cells

Question 8

Sertoli cell functions (7)

Answer 8

1) Form blood seminiferous tubule barrier
2) Active transport of molecules to blood
3) Maintain micro environment
4) Physical movement of developing sperm towards lumen
5) Provision of nutrients to sperm
6) Support for spermiation
7) Secretion of inhibin B

Question 9

Endocrine regulation

Answer 9

GnRH from hypothalamus
➡️ FSH and LH
➡️ Androgen binding protein
↘️ Leydig cells ➡️ Testosterone ➡️ Sertoli cells
↘️ Secondary Sexual Characteristics