BIOL 001 Lecture Notes - Lecture 28: Sex Steroid, Corpus Luteum, Estrous Cycle

• School: College of The Sequoias
• Department: Biology (BIOL)
• Course: BIOL 001
• Professor: Dillard

Document Summary

All species endometrium thickens before ovulation. Estrous cycle: fertile, sexually receptive ( in heat ) only at certain times of the year most mammals have this. Menstrual cycle: fertile intermittently on cyclic basis. Involves the hypothalamus, anterior pituitary, ovaries, uterus. Repeats every approx 28 days unless fertilization + implantation occur. Prepares the female body for pregnancy (whole point of menstrual cycle) Approx 28 day cycle, 2 overlapping cycles. Follicular phase days 1-13 of the cycle (occurs before ovulation) Luteal phase days 15-28 occurs after ovulation. Proliferative phase days approx 6-13 occurs before ovulation. Secretory phase days 15-28 occurs after ovulation. Female sex hormones liteum, secreted from ap. Fsh - stimulates growth of follicles, secreted from ap. Lh - stimulates ovulation with fsh, stimulates leftover follicle tissue -> corpus. Secondary sex characteristics breast development, broadening of the pelvis, fat and muscle distribution (long term) (short term) stimulates monthly prep for pregnancy grows endometrium lining.