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Chapter 16 ~ Human Reproduction. Mammalian reproduction, I u The Human Male u Testes ~ male gonads –Contained w/in scrotum due to temp. u Seminiferous.

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Presentation on theme: "Chapter 16 ~ Human Reproduction. Mammalian reproduction, I u The Human Male u Testes ~ male gonads –Contained w/in scrotum due to temp. u Seminiferous."— Presentation transcript:

1 Chapter 16 ~ Human Reproduction

2 Mammalian reproduction, I u The Human Male u Testes ~ male gonads –Contained w/in scrotum due to temp. u Seminiferous tubules ~ sperm formation (spermatogenesis) u Leydig cells ~ hormone production u Epididymis ~ sperm development u Vas deferens ~ sperm propulsion u Seminal vesicles ~ semen u Prostate gland ~ anticoagulant; nutrients, sperm activation u Bulbourethral glands ~ acid neutralizer – cleanses urethra u Penis/urethra ~ semen delivery

3 Mammalian reproduction, II u The Human Female u Ovaries~ female gonads u Follicle~ egg capsule –Oocyte – immature egg u Graafian follicle – contains mature eggs – ovulation (release) u Corpus luteum~ hormone secretion u Oviduct (fallopian tubes)~ fertilization u Uterus/endometrium~ womb/lining – implantation site u Cervix/vagina~ sperm receptacle

4 Spermatogenesis u Puberty until death! u Seminiferous tubules ~ location u Primordial germ cell (2N)~ differentiate into…. u Spermatogonium (2N) ~ sperm precursor u Repeated mitosis into…. u Primary spermatocyte (2N) u 1st meiotic division u Secondary spermatocyte (1N) u 2nd meiotic division u Spermatids (1N)~ Sertoli cells provide nutrients u Sperm cells (1N)

5 Oogenesis u As embryo until menopause... u Ovaries u Primordial germ cells (2N) u Oogonium (2N) u Primary oocyte (2N) u Between birth & puberty; prophase I of meiosis u Puberty; FSH; completes meiosis I u Secondary oocyte (1N); polar body u Meiosis II; stimulated by fertilization u Ovum (1N); 2nd polar body

6 The female pattern u Ovarian/Menstrual cycles~ u Menstrual phase – endometrium sloughs off u Proliferative (follicular) phase –endometrium repairs and thickens –Follicle-stimulating hormone (FSH) – causes primary follicle to grow –Ovulation occurs – release of oocyte – triggered by luteinizing hormone (LH) u Secretory (luteal) phase – glands release nutrients and lining becomes vascularized

7 Embryonic & fetal development u Gestation ~ pregnancy u 1st trimester: u organogenesis u fetus (week 8; all adult features) u HCG (human chorionic gonadotropin) hormone (menstruation override; pregnancy test detection) u Parturition ~birth u Labor ~uterine contractions u Lactation ~prolactin (triggered by parturition) & oxytocin (triggered by nursing) –Mammary glands

8 Modern technologies


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