The cell membrane provides protection to the cell and regulates what passes in and out through selective permeability. There are three main types of permeability - diffusion which is the passive movement of molecules from high to low concentration, osmosis which is the movement of solvent molecules from low to high concentration, and active transport which requires energy and includes phagocytosis which is the engulfing of large particles and pinocytosis which is the uptake of fluid. The cell membrane controls these processes to allow the cell to function properly.

1. BIOLOGY

2. Functions of the cell membrane
Cell membrane provides
protection to the cell
It is the selective permeable in
the nature so it regulates the
passage for substances in and out
of the cell

3. What is permeability?
The property of plasma
membrane to the passage of
substances in and out of the
cell is called
PERMEABILITY.

4. Types of PERMEABILITY
Following some types of
permeability.
1)Diffusion (passive transport)
2)Osmosis
3)Active transport

5. DIFFUSION
The movement of solute
molecules from the reign of
higher concentration to be reign
of lower concentration is called
DIFFUSION.
OSMOSIS
The movement of solvent molecules
across cell membrane from lower to
higher concentration towards lower
concentration gradient (from higher to
lower concentration) is called osmosis.

6. ACTIVE TRANSPORT
The movement of
molecules across cell
membrane but it
utilizes energy
It has two types
Phagocytosis
pinocytosis

7. PHAGOCYTOSIS
it is called the cell eating process
It is the process of engulfing of large particles through
cell membrane.
Example :
white blood cells engulf
bacteria and destroy them.

8. PINOCYTOSIS
It is called the cell drinking process
It is the process of up taking of fluid in
bulk in the form of vesicles through
cell membrane.

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