bio ch 13 reproduc

  1. wolffian ducts
    • develop internal male genitalia
    • disappears if no Y chromosome and fetus woman
    • stim. to develop by testosterone
  2. testosterone
    • main male sexual hormone
    • produced by the testes
    • secreted by interstitial/leydig cells
    • high during gestation and puberty, v low before puberty
    • determine secondary sex characteristics
    • stim. division of spermatogonia
  3. dihydrotestosterone
    • metabolized testosterone produces this androgen
    • crucial in dev of external male genitalia
  4. mullerian ducts
    • develop female internal genitalia
    • disappears if Y chromosome present

    Mullerian Inhibiting Factor: produced if Y chromosome present and inhibits its action in males
  5. gonadotropin releasing hormone
    • tropic hormone sec from hypothal
    • stim pit. to release gonadotropins (LH, FSH)
  6. embryogenesis steps
    cleavage, blastulation, gastrulation, neurolation
  7. blastocyte
    trophoblast: ring of cells. makes the chorion

    inner cell mass: tight clump of cells inside the ring. forms the embryo, amnion (fluid of embryo), yolk sac (RBC synthesis), and allantois (blood vessels of umbilical cord)
  8. ectoderm
    • outlayer, develops into things w outer epithelium
    • NS
    • pituitary and medulla
    • corena and lens
    • epidermis of skin derivatives (hair, nails)
  9. mesoderm
    • middle layer, comes from endoderm
    • all muscle, bones, and connective tissue
    • entire cardio and lymph system
    • urogenital organs
    • dermis of skin
  10. endoderm
    • inner layer, forms things w inner epithelium lining
    • GI tract epithelium
    • GI glands
    • respiratiory epithelium
    • epithelium of urogenitals
    • bladder
  11. oxytocin
    • sec. from posterior pituitary
    • promotes uterine contractions (stim. by stretch receptors in cervix)
    • responsible for milk release/lactation (stim. by suckling)
Card Set
bio ch 13 reproduc
bio ch 13 reproductive sys