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.
Last updated
About Blood Vessels
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.
Practise Circulation
695 free Circulation MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
95% of the cytoplasm of red blood cells is the___________?
A characteristic feature of the closed circulatory system is the
A condition in which the artery is thickened and blocked by cholesterol is called;
A normal resting blood pressure for a young adult is recorded as
Accurate name given to blood is ___________ ?