Membrane Structure and Function
Cholesterol is essential for normal membrane functions because it

spans the thickness of the bilayer
cannot be made by higher organisms
keeps membranes fluid.
plugs up the cardiac arteries of older men

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Membrane Structure and Function
Exocytosis is the secretion of proteins

out of the cell across the plasma membrane into the intracellular space
is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane
out of the cell across the plasma membrane into the extracellular space
is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane

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