The blood-brain barrier allows to enter the brain.

glucose

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glycogen

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glucagon

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glycerol

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Solution

The correct option is A glucose
In the capillaries that form the blood–brain barrier, endothelial cells are wedged extremely close to each other, forming tight junctions. The tight gap allows only small molecules like glucose, lipid-soluble molecules, and some gases (oxygen, carbon dioxide) to pass freely through the capillary wall and into brain tissue.

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Similar questions

The blood brain barrier in brain exist in ___

Assertion [A]: Glucagon lowers the blood sugar level.

Reason [R]: Insulin converts the glycogen stored in the liver to glucose.

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