Chap 52 notes - Chapter 52 At ovulation and 5 min after...

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Chapter 52 At ovulation and 5 min after ejaculation, sperm pass into uterus * prostaglandins in semen initiate uterine contractions, driving sperm toward egg * One sperm fertilizes the egg; other sperm prevented Fertilization Fig 49-16 Human Sperm Cells Fig 49-16d Early Development 1 * Secondary oocyte is fertilized * development begins * embryo implants in uterus * Human chorionic gonadotropin (hCG) * secreted by membranes around embryo * maintains the corpus luteum * hCG in blood = early pregnancy indication Cleavage and Implantation Fig 49-17 Early Development 2 * First 2 to 3 months of pregnancy * corpus luteum secretes large amounts of estrogen and progesterone needed to maintain pregnancy * E stimulates development of uterine wall * P inhibits contractions * Inhibit FSH and LH so that no new follicles develop (and no menstrual cycle) * After 3 months * Corpus luteum deteriorates * placenta (organ of exchange between mother and embryo) assumes this function KEY CONCEPTS *
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