The diameter of the human capillary is:
Correct answer: D. 8 microns
- A. 5 microns
- B. 6 microns
- C. 7 microns
- D. 8 microns
Explanation
The correct answer is 8 microns. Human capillaries typically have a diameter of about 8 to 10 microns, which is just enough to allow red blood cells to move through them in single file. The endothelial cells that form the capillary walls are crucial for their function. Options A, B, and C represent diameters that are too small for typical capillary function, as they would restrict the movement of red blood cells.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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