Module 1 - Module 1 Atomscellstissuesorgansorgan systems 3...

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Module 1 Atoms cells tissues organs organ systems Interior of body and external environment separated by a layer of epithelial tissue Need a way to get nutrients in and waste out Need a way to get nutrients to the cells Need to get oxygen to the cells for energy production and get rid of waste Need a way to filter the fluids of the body to get rid of waste without losing valuable solutes Total body water 60% total body wt 42L for man weighing 70kg Outside the cells (extracellular ECF) = 1/3 body wt rich in Na+ -Interstitial} Similar in composition but -Plasma} is rich in proteins -Lymph Inside the cells (intracellular ICF) = ½ body wt rich in K+ Over 200 different kinds of cells are grouped into 4 major types: Neurons – specialized to receive or transmit electrical signals - Functions: o Information processing – CNS o Sensory – eyes, ears, skin o Control of movement – muscles, glands, etc. Muscle cells – muscle can contract and conduct electrical impulses
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Module 1 - Module 1 Atomscellstissuesorgansorgan systems 3...

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