illustrate the significance of membranes by taking an example.
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The cell is not an amorphous sack of components, but a complex structure filled with organelles. Examples include:
endoplasmic reticulum
mitochondria
nucleus
Membranes are not passive barriers.
They control the structures and environments of the compartments they define, and thereby the metabolism of these compartments.
The membrane itself is a metabolic compartment with unique functions.
Membranes are dynamic.
They can move.
Their components are continuously synthesized and degraded.
The primary event in cell death (e.g. myocardial infarction) may be damage to the cell membrane, leading ultimately to cell death.
Preview: In the following sections we will look at membranes from the perspectives of
chemical components
structure
function
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