Biology · Human Circulatory System
Which one of the following statements is true about the human circulatory system?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Veins generally carry deoxygenated blood back toward the heart.✓
- 2The dark clot formed over a wound is primarily due to white blood cells.
- 3Deoxygenated blood flowing through the veins is blue in color.
- 4Veins have thick muscular walls and do not contain valves.
Correct answer
Veins generally carry deoxygenated blood back toward the heart.
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