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Bio Lab 10

QuestionAnswer
Why does the location of the scotum and contraction of the dartos muscle help regulate the temperature of the testes? Because normal sperm production requires a temperature of 2-3 degrees Celsius below core body temp.
What occurs within the seminiferous tubules located in the testes? Spermatogenesis.
What occurs in the epididymis? Sperm maturation
Functions of ductus (vas) deferens? moves sperm during sexual arousal. Can also store sperm for several months.
What is the benefit of alkaline, fructose and clotting factors in the seminal vesicles? Alkalinity helps neutralize the acidic environment of the male urethra and female reproductive tract. Fructose is needed for ATP production for sperm motility, clotting factors help semen coagulate after ejaculation.
Why is the prostate gland problematic for men as they age? Because it surrounds the urethra and when it enlarges it can constrict the urethra.
Purpose of the bulbourethral glands? Secrete an alkaline fluid in urethra that protects the passing sperm by neutralizing the acids from urine
Function of the acrosome of a sperm? Contains enzymes that help penetrate the barrier surrounding the ovum.
Function of the head of a sperm? Contains genetic material.
Function of the body of a sperm? has mitochondria to provide energy for movement.
Function of the tail of a sperm? Used for movement
Menstrual phase? Days 1-5. Progesterone and estrogen are low. Stimulates primary follicle.
Preovulatory phase? Days 6-13. Etrogen increases stimulating further follicular development. GnRH increases and FSH and LH. The primary oocyte undergoes meiosis to form secondary oocyte.
Days 14 of reproductive cycle Estrogen peaks and LH surges. The mature follicle ruptures and releases the secondary oocyte.
Postovulatory and secretory phase? Days 15-28. Collapsed follicle becomes corpus luteum secreting progesterone, estrogen and inhibin. If secondary oocyte isn't fertilized he corpus luteum degenerates and cycle begins again.
Created by: Lillejoa
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