Flow of blood in the capillaries is adjusted by?
Correct answer: B. Pre-capillary sphincters
- A. Heart directly
- B. Pre-capillary sphincters
- C. Meta-arterioles
- D. Valves
Explanation
The flow of blood in the capillaries is primarily adjusted by pre-capillary sphincters, which regulate the entry of blood into the capillary network based on tissue needs.
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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.
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