1. Colorado Agriscience Curriculum Animal Science Unit 4- Reproduction and Genetics Lesson 3 Male Hormones of Reproduction

2. (Lesson 3 – Male Hormones of Reproduction TM.A) Hormones – Chemicals secreted by an animal that affect other parts of the organism.

3. (Lesson 3 – Male Hormones of Reproduction TM.B) Hormones in Male Reproduction Gonadotropic Releasing Hormone (GnRH) – Hormone that stimulates the gonads. Follicle Stimulating Hormone (FSH) – Causes production of sperm cells. Luteinizing Hormone (LH) – Causes endocrine cells in the testes to produce the male hormone – testosterone. Testosterone – The steroid hormone responsible for the growth and development of secondary sex characteristics in a male such as growth and maintenance of male sex organs and the production of sperm.

4. (Lesson 3 – Male Hormones of Reproduction TM.C) Hormones are secreted from glands. -Hypothalamus – Area of the brain directly above the pituitary that produces one of the hormones which control reproduction. Gonadotropic Releasing Hormone (GnRH). -Pituitary – Gland situated beneath and stimulated by the hyphalamus, releases follicle stimulating hormone (FSH) and Luteinizing hormone (LH), which serve such functions as stimulating production of sperm and testosterone in males.

5. (Lesson 3 – Male Hormones of Reproduction TM.D) Negative Feedback –In the endocrine system, the means of self- regulation by which the body maintains correct hormone levels.

6. Negative Feedback (Lesson 3 – Male Hormones of Reproduction TM.D) Biggs, Kapicka, Lundgren, Biology The Dynamics of Life Copyright Glencoe/McGraw-Hill 1998.