ANAT 205 Final: Anatomy & Physiology lecture-17

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17 Jul 2019
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They face the extracellular and intracellular fluids of the cell. The nonpolar, fatty acid ends of the phospholipids are hydrophobic (water-fearing) They face away from the fluid on either side of the membrane. The proteins in the cell membrane function as membrane channels, carrier molecules, receptor molecules, enzymes, or structural supports in the membrane. Membrane channels and carrier molecules are involved w/ movement of substances through cell membrane. Receptor molecules are part of the intracellular communication system that enables cell recognition and coordination of activities of cells. Allow some substances, but not others, to pass in/out of cells. Enzymes, glycogen, and k+ ions are found more intracellularly. Na+, ca2+, and c- are found more extracellularly. Movement through the membrane may be passive or active. Does not require the cell to expend energy. Active transport, secondary active transport, endocytosis, and exocytosis.

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