Male Physiology (Colombo) - week 6 Flashcards
T or F: the sperm is a diploid cell
False: Haploid cell
What is the function of the acrosome?
- Head of sperm
- contains enzymes which breakdown outer layer of ovum for penetration
What is the axoneme?
Cytoskeletal component of sperm flagella. (microtubules)
Rich w/ mitochondria to produce energy fro motor
What 2 hormones activate spermatogenesis?
LH & FSH
What is the function of Sertoli Cells?
- act as nurses to developing sperm
- also form blood-testis barrier aka sertoli cell barrier
Main difference between spermatogenesis & oogenesis?
Spermatogenesis results in 4 spermatids whereas oogenesis results in 1 oocyte & 3 polar bodies
T or F the sperm is not motile as it enters the seminiferous tubule
True
Name the 3 hormones released by anterior pituatary and their respective functions
LH: stimulate leydig cells ( secrete testosterone/activate spermatogonia)
FSH: stimulates sertoli cells (from estrogen from testoterone)
Growth Hormone: total regulation of testes metabolism
What inhibits anterior pituitary?
Inhibin: secreted by seretoli cells
Negative feeback in excess FSH
Low or High temps are most efficient for spermatogenesis?
Low temps
What do the seminal vesicles secrete?
- Fructose
- prostoglandins
- fibrinogen
What does prostate gland secrete
- clotting enzyme
- pro-fibrinolysin (helps breakdown clot)
- Alkaloids - to neutralize the vagina
Bulbourethral gland secretion?
Pre-ejaculate (lubricating function)
What 3 sturctures contribute to the finished product of semen?
- seminal vesicles
- prostate
- bulbourethral gland
pH of semen?
ph 7.5
What 2 muscles contribute to ejaculation?
Ischiocavernosus
&
bulbospongiosus
What is the main function of testosterone?
Drive division of spermatagonia
How is estrogen formed in the male body?
Formed from testosterone by seretoli cells which are activated by FSH
Estrogen regulates spermatogenesis
These muscles are involved in rhythmic contractions for sperm ejaculation. They are….
Ischiocavernosus
Bulbospongiosus
