36.1 - Spermatogenesis Flashcards
-Testes
-Continuous process (keep producing)
-Keep Stem Cells
-Multiple Sperm (4)
-Small – mobility
-Two meiotic divisions
-64-72 Days
-400 million per day
-Negative Feedback
-4 Sperm per primary spermatocyte
Spermatogenesis (Slide 1)
Spermatogenesis Starts
At Puberty (400 million per day 64-72 days produce)
Step 1 (2n)
Spermatogonia (Stem cell) - divides by mitosis to produce one stem cell and one spermatogonium (produce sperm) Male keep stem cells
Step 2 (2n)
Spermatogonium divides several times to produce a primary spermatocytes
Step 3 (2n) - (1n)
Primary spermatocytes enter meiosis (1)
-Meiosis 1 produces haploid/secondary spermatocytes (2)
-Meiosis 2 produces haploid spermatids (4)
Step 4 (1n)
Spermatids develop into functional sperm (4)
What traits do sperm have that allow them to swim
Small
Tail
Condensed Nuclei
How is FSH Produced / Effect
Puberty Hypthalamus Produces GnRH
Stimulates the pituitary to produce FSH and LH
FSH - Acts on the Sertoli cells to promote inhibin, which promotes spermatogenesis
How is LH Produced / Effect
Puberty Hypthalamus Produces GnRH
Stimulates the pituitary to produce FSH and LH
LH acts on Leydig cells to promote testosterone, which proteomes spermatogenesis
What type of feedback loops monitor spermatogenesis?
Negative Feedback loop to maintain an appropriate level of hormones
Constant through adulthood
(Slide 2)
Seminal Vesicle
Adds thick yellow substance (sperm energy)
Prostate Gland
Add thin Milly substance (sperm nutrients)
Bulbourethral Gland
Nutrilize acid in urine
Sperm Tract
Testis - Epididymis - Vas deferens - seminal vesicle - ejaculation duct - urethra - out
