The walls of the atria are thinner than those of the ventricles because the atria
Correct answer: B. never contract at all
- A. pump blood only into the adjacent ventricles
- B. never contract at all
- C. pump blood to the whole body
- D. contain no muscle tissue
Explanation
Atria need only enough force to top up the ventricles below, so their muscle is thin. The left ventricle, which drives blood around the entire body, has the thickest wall of all four chambers.
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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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