Membrane Structure and Function
Biological membranes are like water beds because

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

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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
out of the cell across the plasma membrane into the intracellular space
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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