Arteries have thick walls rich in elastic fibres because they
Correct answer: C. must withstand and smooth out the high pressure of blood from the heart
- A. carry deoxygenated blood only
- B. must collapse when empty
- C. must withstand and smooth out the high pressure of blood from the heart
- D. need to store lymph between meals
Explanation
Each heartbeat stretches the elastic walls, which then recoil and keep blood moving between beats, converting a pulsatile flow into a steadier one. Veins work at low pressure and so have thinner walls.
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About Human Heart
The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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