Question

Give the functions of plasma membrane.

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Answer 1

Answer:

• Plasma membrane imparts shape to the cell.
• Plasma membrane protects the cell from injury.
• Plasma membrane regulates the cellular semi-permeability, reabsorption, excretion and secretion.
• Various cell organelles can be formed within the cell, with the help of plasma membrane.
• It regulates cellular interactions in the formation of tissues and the defence against foreign bodies.
• The plasmalemma protects a cell from its surrounding environment.
• Many membrane proteins serve as enzymes.
• The cell membrane separates protoplasm from the external environment to maintain the individuality of the cell.
• It also acts as a selectively permeable membrane to allow only specific substances in and out of the cell.
• It helps in intake of molecules by active or passive absorption.
• It acts as a receptor for various chemical stimuli such as amino acids, hormones and sugars.
• In unicellular organisms like Amoeba, pseudopodia are formed by projection of plasma membrane.
• Ingestion of food and water by endocytosis or pinocytosis takes place with the help of plasma membrane.