The blood-brain barrier,which keeps harmful molecules from entering the brain,is composed of __________ that form a fatty coating around tiny blood vessels.
A)myelin sheath
B)glial cells
C)the Nodes of Ranvier
D)neurotransmitters

Question

Quizplus · Accepted Answer

Glial cells, including astrocytes, form a protective coating around the blood vessels in the brain, which helps to prevent harmful substances from entering the brain tissue. The myelin sheath is a fatty coating that surrounds nerve fibers, while the Nodes of Ranvier are small gaps in the myelin sheath where action potentials occur. Neurotransmitters are chemical messengers that transmit signals between neurons.

The Blood-Brain Barrier,which Keeps Harmful Molecules from Entering the Brain,is