BIO172W08Lec32CT - Biology 172 L e c t u r e 3 2 C h e m ic...

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1 Lecture 32—Chemical Signals: Animals April 2, 2008 Today s Outline 1.Overview of chemical signals in animals 2.Mammalian endocrine system - Development & growth - Homeostasis - Stress 3.Hormone receptors - Steroid hormones - Epinephrine Announcements Reading: Ch.47 (pp.1076-1096 omit details not covered in lecture) Discussion this week: Stress Axis Biology 172 Six Major Categories of Chemical Signals Hormones Chemical Characteristics of Hormones Human Endocrine System 1. Growth Hormone = peptide from anterior pituitary Stimulates production in peripheral tissues of growth factors (secreted peptides with endocrine, Growth factors regulate the cell cycle, cell differentiation and cell survival 2. Gonadal hormones = steroids Produced in gonads (sex organs) Androgens (testosterone) and estrogens (estradiol) Regulated by hormones from the pituitary gland Seasonal or cyclic activity 3. Juvenile hormone and ecdysone = steroids Regulate growth and metamorphosis in insects Hormonal Regulation of Homeostasis: Glucose Insulin triggers uptake and storage of glucose in effector cells in response to high blood glucose Glucagon functions in the reverse way when levels of blood glucose are low Diabetes mellitus Type I = lack of insulin Type II = defects in the insulin receptor function – Large volume of urine containing glucose
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BIO172W08Lec32CT - Biology 172 L e c t u r e 3 2 C h e m ic...

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