Reproductive Hormones

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Reproductive Hormones
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Presentation transcript:

Reproductive Hormones

Reproductive Hormones Male gonads (testes) produce sperm. Female gonads (ovaries) produce eggs.

Male Reproductive System

Male Reproductive System Sex hormones: androsterone & testosterone. Function: Stimulates spermatogenesis. Stimulates secondary sex characteristics. Increases secretion of body oils. Increases sex drive.

Male Reproductive System

Female Reproductive System

Female Reproductive System Sex hormones: Estrogen & Progesterone

Female Reproductive System Ovaries contain cells called follicles. Follicles consist of: Primary oocyte. Granulosa cells.

OOgenesis FSH & LH released. Primary oocyte undergoes meiosis I. Forms a secondary oocyte and a polar body. Granulosa cells divide. Forms a fluid-filled cavity (antrum) around the secondary oocyte. Serves as nutrition for oocyte.

Ovulation Secondary oocyte ruptures ovarian wall. Enters the fallopian tubes. Remaining follicle cells form the corpus luteum. Secretes estrogen and progesterone.

Oogenesis & Ovulation

Meiosis II Dependent on Fertilization No fertilization? Corpus luteum degenerates and leaves a scar (corpus albicans). Fertilization? Meiosis II occurs. Secondary oocyte divides to form a fertilized egg/ovum (zygote) & a polar body.

Female Reproductive System

Menstrual Cycle 4 phases: Flow (day 0 – 5). Follicular (day 6 – 13). Ovulatory (day 14). Luteal (day 15 – 28).

Menstrual Cycle Flow Phase: Shedding of endometrium. Marks beginning of menstrual cycle.

Menstrual Cycle Follicular Phase: Development of follicle. Estrogen secreted. Triggers thickening of endometrium.

Menstrual Cycle Ovulatory Phase: Ovulation occurs. Secondary oocyte released from ovary.

Menstrual Cycle Luteal Phase: Corpus luteum develops. Secretes estrogen and progesterone. Endometrium continues to thicken. * Progesterone inhibits further ovulation & prevents uterine contractions.

Menstrual Cycle No fertilization? Estrogen and progesterone decreases. Uterine contractions cause the shedding of the endometrium.

Menstrual Cycle

*Males and females both have male and female sex hormones, but in varying levels.

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