Question

How diffusion takes place through plasma membrane?

Answer 1

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Some of the proteins that are stuck in the plasma membrane help to form openings in the membrane. Through these channels, some substances such as hormones or ions are allowed to pass through. They either are “recognized” by a receptor within the cell membrane, or they attach to a carrier molecule, which is allowed through the channels. Because the plasma membrane is choosy about what substances can pass through it, it is said to be selectively permeable