ANSC 340 Lecture Notes - Lecture 27: Mitosis, Spermatozoon, Oviduct
27 Dec 2016
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Mechanisms of erection: nitrix oxide (no) facilitates conversion of gtp to cgmp (by guanylate cyclase) Inhibits vasoconstriction: pde5 causes vasoconstriction, which inhibits vasodilation. Causes flaccid-ness: facilitates conversion of cgmp to gmp by pde5. Penis retractor muscle (holds sigmoid flexure) must relax to straighten sigmoid flexure. Ram- short (as soon as comes in contact) Sperm in the female tract: immediate transport. Gelatinous plug/viscous last semen deposition in attempts to prevent. Phagocytosis- white blood cells attack everything foreign including sperm. *increase in white blood cells during estrus to fight disease. Privileged pathways = thin mucus allows more movement of sperm towards destination. Capacitation initiated by hepperin which is found in female repro tract (can also be initiated in cervix) Capacitation= hpb binding protein + hp protein = bind + awaken sperm. Uterotubal junction (utj)- sperm hang out; if not, will die 6-10 hours post-insemination. Something significant happens here but unsure what: fertilization.
