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 to the heart.✓
- 2A dark clot formed over a cut is primarily due to white blood cells.
- 3Deoxygenated blood is bright blue in colour inside the body.
- 4Veins have thick walls and no valves are present.
Correct answer
Veins generally carry deoxygenated blood back to the heart.
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