Presentation on theme: "Hormones Chemical substances - produced by endocrine glands - secreted into the blood - circulate throughout the entire body. - target tissues respond."— Presentation transcript:
Hormones Chemical substances - produced by endocrine glands - secreted into the blood - circulate throughout the entire body. - target tissues respond to hormones.
Hormones you are responsible for: Sex Hormones – Produced by the gonads: Androgens: Testosterone, Androstenedione, DHT,Androstenediol Estrogens: Estradiol, Estrone Progesterone Gonadotropins – Produced by the pituitary: Luteninizing Hormone (LH) Follicle Stimulating Hormone (FSH) Gonadotropin Releasing Hormone (GnRH) – Produced by the hypothalamus
What you need to know about the Steroid Biosynthetic Pathway 1.Cholesterol is the precursor to the all of the steroids. 2.Masculinizing and Feminizing hormones utilize the same biosynthetic pathway. No step in the pathway can be skipped. 3.Masculinizing and Feminizing hormones are very similar in size and chemical composition. 4.The main difference is that estrogens have aromatic rings.
Testosterone at Puberty
Estrogen at Puberty
Negative Feedback System Testes (Interstitial Cells Produce Testosterone) LHTestosterone Hypothalamus - Thermostat Pituitary Gland – Produces LH