IB35ACS Study Guide

Human migration disease location and spread o host

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Unformatted text preview: perm motility o Cowper’s: pre- ejaculate to cleanse urethra o Spermatogenesis takes 75 days: sperm first form in testis (55 days) and then mature in epididymis (20 days) Female Anatomy o o ● ● ● ● ● Fallopian tubes: two very fine tubes lined with ciliatedepithelia, leading from the ovaries of female mammals into the uterus, via the utero- tubal junction. o Fimbria: fringe of tissue around the ostium of the Fallopian tube, in the direction of the ovary. Oogenesis o 7 million primordial eggs 3 months before birth o 100- 200 eggs by menopausal transition o lose 1 egg every 4 minutes to atresia o small number lost through ovulation (~500) Oogenesis and Menstruation o Fertilization and Implantation o 20% chance of getting pregnant each cycle, 85% chance getting pregnant in a year (BIG CAVEAT) o hCG=human chorionic gonadotropin produced by embryo o ½ of all conceptions spontaneously abort before woman even knows she’s pregnant, 15- 20% known pregnancies end in miscarriage Lactation o very important hormone: prolactin (men produce it too) o Prolactin promotes feeling of relaxation and well- being, highest levels at night, promotes deeper sleep The Importance of Hormones o Hormones are molecular triggers o Estradriol and Progesterone, testosterone produced in gonads o FSH (follicle- stimulating hormone), LH (luteinizing hormone), prolactin produced in anterior pituitary o Male hormones & spermatogenesis ▪ hypothalamus and pituitary send FSH to testis, LH...
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