We can divide all the transportation methods into two types
1. Passive transport
2. Active transport
1. Passive transport
Transport of substances from a region of hi concentration to a region of low concentration . Transportation occurs through a concentration gradient without using energy.
There are three methods of passive transport
1. Simple diffusion
Lipids soluble substances dissolve in phospolipid bi layer and pass through the membrane.
2. Facilitate diffusion
Mediated by carrier proteins
3. Osmosis
Water and water soluble substances are transported through hydrolipic channels of membranus protein across the membrane.
2. Active transport
Transport of substances from a region of low concentration to hi concentration against the concentration gradient using A.T.P (energy)
There are two types of active transport
1. Carrier proteins,
Mediated by carrier proteins as transport occurs against concentration gradient , energy is consumed
2. Bulk transport,
Transport of substances in large quantities encloses vesicles .
There are two types of bulk transport
1. Endocytosis,
Intake of substances by forming vessicles is called endocytosis
There are two types of endocytosis
1.Phagocytosis
2.Pinocytosis
2. Exocytosis,
Removal of substances out of the cells is called exocytosis