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Question : Describe endocytosis. |
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Answer» Solution :Cell surface membrane are able to TRANSPORT individual molecules and ions. There are processes in which a cell can transport a large quantity of solids and liquids into cell endocytosis or out of cell exocytosis. Endocytosis: During endocytosis the cell wraps the cell surface membrrane around the MATERIAL and brings it into cytoplasm INSIDE a VESICLE. there are two types of endocytosis: 1. Phagocytosis- Particle is ingulfed by membrane, which folds around it and forms a vesicle. the enzymes digest the material and products are absorbed by ctyoplasm. 2. Pinocytosis-Fluid droplets are engulfed by membrane, which forms vesicles around them. Exocytosis: Vesicles fusse with plasma membrane and eject contents. this passage of material out the cell is known as exocytosis. this material may bea secretion in the case of digestive enzymes, hormones or mucus. |
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