Membrane Structure and Function
Biological membranes are like water beds because

they are always moving
the membrane is thin compared to the enclosed volume
they (normally) do not leak their contents
All of these

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Membrane Structure and Function
Exocytosis is the secretion of proteins

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
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

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