1. The Endocrine System

2. Purpose:
Produce hormones that maintain homeostasis by regulating & coordinating the functions of virtually all organ systems
Glands
Organs that secrete hormones
Hypothalamus, pituitary, thyroid, parathyroid, pancreas, kidney, adrenal, ovaries / testes, etc.

3. Endocrine glands
YouTube “Human Body – Endocrine System – Kids Animation…”

4. Hormones
Chemical messengers  released by cells, transported through the body and have affect on other cells
Example - blood water levels are low, pituitary releases ADH (Anti-diuretic Hormone) into bloodstream, ADH transported to kidneys, stimulates water re-absorption!
Other examples – table 2, pg 175

5. “Fight or Flight” Response
A startling or fearful event triggers a strong reaction from both the nervous and endocrine systems (preparing the body for defense or escape)
Sympathetic nerves stimulates:
increased heart rate
diversion of blood to muscles
dilation of pupils
adrenal gland

6. The End!!! Adrenal Gland secretes adrenaline which stimulates:
Increased heart rate
Increased blood pressure
Perspiration
Increased muscle tension
*This response is short in duration – Parasympathetic nerves bring body back to homeostasis (harmful if extended… stress)
The End!!!