Biology · Human Circulatory System
Under normal physiological conditions, blood does not clot inside the blood vessels due to the presence of anticoagulants like heparin. However, which of the following blood vessels are characterized by extremely smooth and flexible walls that prevent contact activation of clotting?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Veins
- 2Brain tissue
- 3Arteries
- 4Capillaries✓
Correct answer
Capillaries
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