Plasma membrane is semi permeable, only certain molecule can move across it. Certain molecule can move across it.
According to fluid mosaiz model plasma membrane
Composed mainly of phospholipids & protein.
Each phospholipid consists of two parts:
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A polar head- hydrophilic- attracted to water.
Non polar tail-hydrofobic- repel water
Phospholipid bilayer also contain cholesterol
Function to strenten the plasma membrane & more flexible.
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It also contain two type of protein: pore protein: form a channel allows small
Molecules or ions through them.
Carier protein: transport bigger molecules such as glucose, amino acid & vit C.