Which feature helps veins return blood to the heart when skeletal muscles contract?
Correct answer: A. One-way valves prevent backward flow
- A. One-way valves prevent backward flow
- B. Thick elastic walls maintain high pressure
- C. A thick myocardium creates the pressure
- D. Small pores allow direct tissue drainage
Explanation
Venous valves keep blood moving toward the heart, while skeletal muscle contraction compresses veins and assists venous return. Veins have thinner walls and lower pressure than arteries, and they do not contain cardiac muscle.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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