Question

Dr. Ramos discussed how difficult it could be to treat infection

in the brain and spinal cord because of how efficiently the
blood-brain barrier protects vulnerable nervous tissues, even from
lie-saving antibiotics. The barrier is mostly simple squamous
endothelial cells, their basal laminae, and astrocytes. Which of
the following statements is false with regard to how this thin
layer of cells creates such and efficient barrier?
a. The endothelial cells contain more tight junctions than are
found in the endothelial cells in capillary walls in other regions
of the body.
b. extra tight junctions force molecules to pas between
endothelial cells, which reduce the amount of substance entering
the cell by endocytosis.
c. the combination of barrier endthelial cells, the extra tight
junctions, and very selective barrier that is only a few cell
layers thick leads to a limited ability to transport substances
into and out of the cell.
d. Protein channels selectively allow for the transport of vital
substances, such as glucose and amino cids that are unable to pass
into the brain extracellular fluid without assistance.

Answer 1

The correct answer is option B.

Explanation:

BBB or the blood-brain barrier is a semipermeable membrane that is highly selective membrane present in the brain. It is composed of endothelial cells that have tight junctions.

This selective membrane only allows molecules that are hydrophobic in nature and block to pass the hydrophobic molecules. This barrier allows glucose and amino acids.

Thus, the correct answer is option B.