BIOL164Ch17NotesWin12

BIOL164Ch17NotesWin12 - Figure 17.2 Spermatogenesis...

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1 Ch. 17 – Reproductive Systems • These are the only organ systems that are NOT essential to the life of the organism – But they are essential to the perpetu- ation of the human species! The gonads • = the key reproductive organs because they: – Produce haploid gametes (a.k.a. sex cells, reproductive cells, or sperm and eggs) via meiosis Haploid cell = a cell that has only one copy of each chromosome (23 total) –S e c r e t e sex hormones • The male gonads = the testes , which… – Produce sperm –S e c r e t e testosterone • The female gonads = the ovaries , which… – Produce eggs –S e
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2 The male reproductive system Figure 17.1a The male reproductive system Figure 17.1b
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3 The internal structure of the testis and epididymis
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Unformatted text preview: Figure 17.2 Spermatogenesis Beginning at puberty, normal testes produce 100-300 million sperm per day It takes about 74 days for sperm to develop to maturity Spermatogenesis requires slightly-lower-than-normal body temperature Thus, the testes reside in the scrotum , slightly away from the very warm core of the body Figure 17.3 4 Spermatozoa (sperm) Figure 17.4 Some male reproductive hormones (Leydig cells) 5 The female reproductive system Figure 17.6a 6 The female reproductive system (vulva) Figure 17.6 Figure 17.7 Breast structure The ovarian cycle Figure 17.8 7 The ovarian and uterine (menstrual) cycles are coordinated by hormones Figure 17.8 A review of the ovarian and uterine cycles Approximate follicle count : 2 million (fetal), 700,000 (at birth), 300,000 (at puberty), 400 ovulations throughout the reproductive years (1 per month from puberty to menopause) 8...
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BIOL164Ch17NotesWin12 - Figure 17.2 Spermatogenesis...

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