Psychology 1000 Chapter Notes - Chapter 6: Colostrum, Flagellation, Prolactin

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Egg reaches the uterus in about 5 days if fertilized- otherwise, disintegrates in 48 hours. Cilia move the egg through (doesn"t move on its own) Nucleus in head of sperm contains the dna. Sperm also contain rna carrying instruction for early embryotic development, and a large number of proteins. Acrosome (chemical reservoir) also in head of sperm. Midpiece contains mitochondria (where chemical reactions occur and provide energy- used when sperm lashes tail back and forth- flagellation. Sperm capable of swimming 1-3 cm per hour, but has been recorded that sperm have reached egg within 1. 5 hours- muscular contractions in uterus may help them along. Conception typically occurs on the outer third of the fallopian tube (part near ovary) Of 200 million sperm, about 2000 reach the tube containing the egg. Zona pellucida- thing, gelatinous layer surrounding the egg. Hyaluronidase; an enzyme secreted by the sperm that allows one sperm to penetrate the egg- produced by acrosome.