Blood is carried towards the heart by __________?
Correct answer: C. Veins
- A. Arteries
- B. Capillaries
- C. Veins
- D. none of these
Explanation
Veins return blood towards the heart, using valves and surrounding muscle contractions to prevent backflow, although pulmonary veins are an exception to the usual oxygen-content pattern. Students may choose arteries because they carry blood away from the heart, which is the opposite direction asked here.
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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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