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Warm-Up 3/12/2013 What does the Endocrine System control?

Warm-Up 3/12/2013 What does the Endocrine System control?. What is the Endocrine System? The endocrine system is the system that coordinates and directs the activity of the body’s cells by secretion of hormones The study of hormones and endocrine organs is called endocrinology.

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Warm-Up 3/12/2013 What does the Endocrine System control?

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  1. Warm-Up 3/12/2013 What does the Endocrine System control?

  2. What is the Endocrine System? The endocrine system is the system that coordinates and directs the activity of the body’s cells by secretion of hormones The study of hormones and endocrine organs is called endocrinology.

  3. What is the DIFFERENCE? Nervous System Endocrine System

  4. Interesting Things About the Endocrine System • To collect 1 kg (2.2 pounds) of hormone producing tissue, you would need to collect ALL the endocrine tissue from 8-9 adults! What does this tell you about the organs of this system? • For girls, puberty generally begins sometime between ages 9-13 and for boys, ages 10-15!

  5. Hormones Greek: “to arouse” Hormones are chemical substances that are secreted by endocrine cells into extracellular fluids and regulate the metabolic activity of other cells in the body.

  6. Responding to hormones • Lock and key system • Hormone affects only certain tissue cells or organs called target cell/organ fits receptor on “target” cell targetcell secretingcell non-targetcells can’treadsignal can’treadsignal

  7. The precise changes that follow hormone binding depend on the specific hormone and the target cell type, but usually one or more of the following occurs: Changes in membrane permeability Synthesis of proteins Activation or inactivation of enzymes Stimulation of mitosis Promotion of secretory activity

  8. What prompts the endocrine glands to release or not release their hormones? ?Do you remember NEGATIVE FEEDBACK?

  9. Negative Feedback • The chief means of regulating blood levels of nearly all hormones • Hormone secretion is triggered by some internal or external stimulus. • Three types of STIMULI • 1. Hormonal 2. Humoral 3. Neural

  10. Hormonal Stimulus • Most common stimulus • Endocrine organs are probed into action by other hormones • Hormone release by this mechanism tends to be rhythmic, with hormone blood levels rising and falling again and again.

  11. Humoral Stimulus • Stimulated by the change in blood levels of certain ions and nutrients • Humoral refers to the ancient use of the word humor (the fluids)

  12. Neural Stimulus • In isolated cases • Stimulated by nerve fibers

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