Blood is transported toward the heart by __________?
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Answer: C. Veins
Explanation
Veins function as the primary circulatory vessels transporting blood toward the heart. Valves inside large veins ensure unidirectional blood flow against gravity. Systemic veins collect deoxygenated blood from capillary networks across the body. The cardiovascular system maintains continuous blood circulation through pressure differences. Veins possess thinner muscular walls compared to high-pressure arterial vessels. Skeletal muscle pumps assist venous return in the lower extremities.
Phlebotomists draw venous blood for routine clinical laboratory testing. Varicose veins occur when venous valves fail to close properly. Cardiovascular health depends on efficient venous return to the right atrium. Arteries carry oxygen-rich blood away from the heart toward body tissues. Capillaries are microscopic vessels where nutrient and gas exchange takes place. Choosing none of these is incorrect because veins specifically return blood.
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