What is plasma membrane
Answers
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Plasma membrane or cell membrane is a selectively permeable membrane which allows the certain substances in and out of the cell .
It is the covering of the cell that separates the contents of the cell from its external environment .
It is a living part of the cell and is present in the cells of plants , animals and microorganisms .
It is very thin , delicate , elastic and selectively permeable membrane . It is composed of lipid and protein .
★ Plasma membrane
Plasma membrane is a membrane like wall that is flexible and provides shape to the cell . It also helps the organelles to stay intact inside the cell without getting mixed up with other components of cells .
It is made up of Proteins , lipids and fats .
It allows only selected items to pass in and out of the cell . Hence called Selectively permeable membrane ..
It is also called as cell membrane .
It is porous and thus allows some things to pass in or out .
Carbon dioxide and oxygen pass through it by the process of diffusion .
Water passes through osmosis .
It is found in both : Animal and Plant cells .
★ Supplementary information :
- Diffusion is the process by which substances move in and out of the cell.
- Osmosis is a special diffusion that is the movement of water through semi permeable membrane.