There are four chambers of the heart:
Correct answer: C. Two upper thin-walled atria and two lower thick-walled ventricles
- A. Two upper thick-walled atria
- B. Two lower thin-walled ventricles
- C. Two upper thin-walled atria and two lower thick-walled ventricles
- D. Two upper thin-walled ventricles and two lower thick-walled atria
Explanation
Two upper chambers containing thin walls are called atria whereas two lower chambers containing thick wall are called ventricles.
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About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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