Reproduction part 2

  1. Why do human males have external testes?
    • Male testicles are 3 degrees cooler than core temp.
    • Sperm production is more efficient at lower temps.
  2. adaptations that allow for cooler gonadal temps
    • external testicles
    • sweat glands on scrotum
    • dartos muscle: wrinkle scrotal skin to increase thickness
    • cremaster muscle: elevates testicles closer to body
    • pampiniform plexus: transfers heat from arteries entering to this vein
  3. __ cells produce sperm in the __
    Spermatogenic; seminiferous tubules

    process takes 75 days
  4. Spermatogonia is located near the __
    basal compartment of the seminiferous tubules
  5. Primary spermatocytes become secondary spermatocytes and completes __
    meiosis I

    (page 29 on slide)
  6. Secondary spermatocytes becomes __ and complete __
    spermatids; meiosis II

    (page 29 on slide)
  7. __ make seminiferous tubule fluid & form the __ which separates the __
    • Sustentocytes (Sertoli cells);
    • blood testis barrier;
    • basal & adluminal compartment
  8. __ become sperm with the development of __ to help deploy through the __
    • Spermatids;
    • an acrosome (filled with digestive enzymes), mitochondria, and flagellum;
    • zona pellucida

    (page 32 on slide)
  9. After sperm is made, they go to the __ that has __ to __
    • epididymis;
    • stereocilia;
    • absorb seminiferous tubule fluid

    (page 34 on slide)
  10. From the epididymis, the sperm goes through the __ to the __
    vas deferens; prostate gland
  11. accessory glands
    • seminal vesicle: 60% of semen volume, prostaglandins stimulate uterine contractions, sugars to nourish, immuno-supressants, promote sperm motility
    • prostate gland: enhance sperm motility & movement through uterus
    • bulbourethral glands: produce mucus that neutralizes urine & lubricates urethra
  12. events leading to fertilization: Sperm binds to the __ & undergoes __. Then there is fusion of __. Then a __ occurs with enzymes preventing any other sperm from binding to the egg, then fertilization occurs in which __
    • zona pellucida;
    • acrosomal reaction - release of enzymes to form a slit in the zona pellucida;
    • oocyte & sperm plasma membranes;
    • cortical reaction;
    • chromosomes of male and female gametes join
Author
sophathida
ID
325924
Card Set
Reproduction part 2
Description
Week 9
Updated