UT Arlington BIOL 1334 - Lecture 12 - Reproduction (26 pages)

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Lecture 12 - Reproduction



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Lecture 12 - Reproduction

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Pages:
26
School:
University of Texas at Arlington
Course:
Biol 1334 - Introduction to Biology Ii
Introduction to Biology Ii Documents

Unformatted text preview:

The Reproductive System The Reproductive System Function Perpetuation of an individual s genetic material Not essential for survival Asexual Reproduction Offspring s genes come from only one parent offspring and parents are genetically identical Sexual Reproduction Offspring s genes come from two parents offspring are unique from parents External or internal fertilization The Reproductive System Sex differences in reproduction Males Produce many small cheap gametes sperm Acyclic reproductive function Females Produce fewer large expensive gametes ova Cyclic reproductive function Many small sperm on one large egg The Male Reproductive System Testes Produce sperm sex steroids Housed in scrotum Epididymis Stores sperm while it matures Vas Deferens Transports sperm to ejaculatory duct Seminal Vesicles Prostate Gland Bulbourethral Glands Make other components of semen Penis Made of erectile tissue that fills with blood Discharges semen via urethra The Male Reproductive System Hormonal Control of Testes 1 Hypothalamus secretes releasing hormone 2 Releasing hormone Follicle Stim Hormone FSH and Luteinizing Hormone LH 3 FSH Sperm Production LH Testosterone Sperm Production 4 Testosterone inhibits releasing hormone and LH negative feedback 1 4 2 3 Spermatogenesis Sperm cells start development in seminiferous tubules Start off as diploid 2 copies of each chromosome end up haploid 1 copy Sperm travel to epididymis where they mature become motile and are stored The Female Reproductive System Ovaries Produce ova sex steroids Oviducts Fallopian tubes Site of fertilization Uterus womb Holds developing embryo fetus Endometrium inner lining implantation Cervix Neck of uterus Vagina Birth canal Copulation receives sperm The Female Reproductive System Follicle Egg cell ova surrounding cell layers nourish protect ovum secrete sex steroids The Female Reproductive Cycle Cyclical changes in Ovary Growth of follicles Release of egg cell ovum from one follicle ovulation Hormone secretion



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