Question

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what is the primary function of endothelial cells?
a they combine during fertilization to create new life.
b they make up the inner layer of blood vessels and regulate the movement of gases and fluid.
c they send signals between the brain, spinal cord, and body organs.
d they store fat that can be used for energy.

Explanation:

• Option A: Cells involved in fertilization are gametes (sperm/egg), not endothelial cells. Eliminate A.
• Option B: Endothelial cells line blood vessels (inner layer) and regulate transport of gases/fluids. This matches their function.
• Option C: Nerve cells (neurons) send signals, not endothelial cells. Eliminate C.
• Option D: Adipocytes (fat cells) store fat, not endothelial cells. Eliminate D.

Answer:

B. They make up the inner layer of blood vessels and regulate the movement of gases and fluid.