Page 21 - Cell biology PDC 2024

Phagocytosis of MRSA by neutrophils

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B) Exocytosis: Exocytosis is the opposite of endocytosis. Its
purpose is to get out materials from the cell into the extracellular
fluid. Waste material is enveloped in a membrane and fuses with
the interior of the plasma membrane, then the waste material is
expelled into the extracellular space.
Examples of exocytosis include the secretion of proteins of the
extracellular matrix and secretion of neurotransmitters into the
synaptic cleft by synaptic vesicles

Figure 9:exocytosis

c) Sodium Potassium pump: The sodium–potassium pump is found
in many cell (plasma) membranes. Powered by ATP, the pump
moves sodium and potassium ions in opposite directions, each
against its concentration gradient. In a single cycle of the pump,

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