Reproductive System

Reproductive System - Reproductive System Terminology Gonads primary sex organs sites where reproductive cells(gamets are produced male testes and

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Reproductive System Terminology Gonads : primary sex organs; sites where reproductive cells (gamets) are produced; male testes and female ovaries Gametes (sex cells): male spermatozoa , female ovum/egg Homologous structures : structures that are embryologically the same, then change into different-sex organs Ex: testes and ovaries, spermatozoa and egg, penis and clitoris, scrotum and labia majora Primary sexual characteristics : at birth, what defines male vs. female Secondary sexual characteristics : differences/changes with puberty (development of breasts, axillary/pubic hair, etc); not mandatory for reproduction but enhance reproductive process Male Reproductive System Ejaculate (v.) – process of releasing material from reproductive system Ejaculate (n.) – AKA seminal fluid, semen; consists of supportive fluid and spermatozoa o ~3.5% of ejaculate is sperm (95% is supportive fluid) o “Seme” = seed: believed there was a little person within head of sperm Figure 20.1 (pg. 699): male reproductive system pathway Testis (pl. = testes), testicle: paired structures housed within scrotum; where spermatozoa is produced (~100 million sperm per day); temperature regulation o Testes need a lower body temperature because of the metabolic activity and heat/energy produced o If testes remained in body, body heat and heat produced by metabolism would kill the cells o When it’s cold, testes draw closer to body for body heat Figure 20.4 (pg. 702): testes and internal structures Seminiferous tubules: coiled tubules in testes where sperm is produced o Cell division occurs here and the sperm is transported to a storage site above/on testes (called the epididymis) Nerves and blood vessels, etc. Epididymis: (1) primary storage site for spermatozoa; once activated, sperm moves
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This note was uploaded on 02/27/2008 for the course BISC 212Lx taught by Professor Moyer during the Spring '07 term at USC.

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Reproductive System - Reproductive System Terminology Gonads primary sex organs sites where reproductive cells(gamets are produced male testes and

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