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How do they keep homeostasis?
1. Keeping blood levels of these things (water, salts) stable
2. keeping body temp. stable
3. keeping ph levels stable
system of nerve cells and sometimes a brain to detect smell sound, pain, pressure, heat, light
(transport food, waste, 02) some are thing enough to use diffusion, most have complex systems using a heart
(releases nitrogenous waste) some are thin enough to use diffusion, most use kidneys and skin
(invertebrates) sea anemone, jelly fish, extra cellular, 2 way, gastrovascular cavity, diffusion (no system)
(invertebrates) plinaria, extracellular, 2 way, gastrovascular cavity, diffusion (no system)
(invertebrates) leech, earth worm, extracellular, 1 way, single loop, closed circulatory, several hearts
area inside animal's body where cells secrete enzymes to chemically digest and absorb food, always 2 way
flap of cartilage that covers the trachea during swallowing so that food doesn't enter lungs
heart burn vs GERD (reflux)
stomach ACIDS back up and irritate e. l./stomach CONTENTS back up and irritate e. l.
chemical digestion in stomach
HCL lowers the pH to activate the enzyme pepsin for breakdown of proteins
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