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

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

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Membrane Structure and Function
Exocytosis is the secretion of proteins

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

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