Question

How do neutral solutes move across the plasma membrane?

Answer 1

Plasma membrane is the outermost covering of the cell and regulates the movement of substances into the cell and out from it. It allows the entry of only some substances and prevents the movement of other materials. Hence, the membrane is selectively-permeable.

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Answer 2

Neutral solutes like glucose, most of the amino acids move through the cell membrane by means of facilitated diffusion.

Explanation:

There are transporters like GLUT for Glucose etc which are present on the cell membrane. These facilitated diffusion transporters don’t have any ATPase activity, so they don’t participate in the active transport across the cell membrane.

These transporters are implanted into cell membrane by means of some cellular impulse – like an increase in glucose level increases the number of GLUT 4 transporters into the muscle and hepatic cells. Then, they transport the solutes according to their concentration gradient.