Final 4.8 Flashcards
What is the humans sole purpose in life?
Reproduce
Males produce ________ in ______.
Gametes(sex cells)
Gonads
What does male gonads consist of
Test/testes
•secrete male sex hormone (androgens)
•produce male gametes (sperm)
What are the secondary structures in the male anatomy
-network of ducts
-accessory glands
•store, transport and support sperm
What does the testes and tubules consist of
•seminiferous tubules
•site of spermatogensis
-sperm production
•occurs via meiosis
-special type of cell division
-4 spermatids/division
-each contain 1/2 infraction needed to reproduce
-sperm maturation
•differentiation into mature sperm
•Entire process takes 2-3 months
Where is sperm formed?
In the walls of duct
What does sperm maturation consist of
- mature and move toward lumen of tubules
- “nursed” by nurse (sertoli) cells
- receive androgen from interstitial (leygid) cells
What is sperm production called and what does it include
•spermatogensis
-mesiosis 1 and 2
-final result in males
•4 spermatids
•resemble normal animal cells
What is sperm maturation called
Spermiogensis
What is the differentiation of spermatids
- acrosomal vesicles forms
- flagellum produced
- mitochondria gather around flagellum
- excess cytoplasm lost
What is spermiation
- release of sperm heads from sertoli (nurse) cells
- free to move through duct ( can now participate in ejculation and fertilization)
How does spermatid occur
Golgi apparatus + acrosomal vesicles —> acrosomal vesicle —-> acrosome—-> nucleus & acrosome
What’s the anatomy of spermatozoa
Head -nucleus and acrosome Mid-piece -mitochondria for energy Tail -whip-like -only flagellum in human body
What’s the next stop for sperm after the testis?
Epididymis —> vas deferens
What does the vas deferens include
-muscular tube; move sperm with peristalsis
-expands at end (ampulla)
•sperm storage
-connects to ejaculatory duct
•enters to prostate
•connects to urethra
What does the male urethra consist of
-shared structure in men •male urinary tract •male reporductive tract -passage for contents of ejaculatory duct and ureters - contains three different parts
What are the three different parts in the urethra
-prostatic urethra
•wrapped by prostate
•entrance for ejac duct
-membranous urethra
•crosses urogeniatal floor
-spongy urethra
•contained within penisWhat are the fluids composing semen in the accessory glands?
-seminal vesicles
•paired
•connect at ejac duct
-prostate gland
•chestnut shaped
•convergence point of urinary and male repro system
-bulbourethral(Cowpers) glands
•pairedWhat does sperm consist of
- 10% of semen
- 20-100 million /ml
- 187 million / ejaculatory
What does seminal vesicle consist of
60% of semen
- sticky, yellow fluid
- nutrient rich
What does prostate glands consist of
30% of semen
- thin, milky fluid
- good for swimming
What does bulbourethral glands consist of
- not semen
* preejaculatory fluid
Sperm production is tightly regulated by?
Brian structure and hormones
What does the hypothalamus regulate?
Body temp Thrust Hunger Sleep Stress Response Aggression Sexual behavior
