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

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Presentation transcript:

Reproductive Hormones

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

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

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.