Which of the following muscles that make the walls of heart and are NOT present anywhere else in the body?
Correct answer: B. Cardiac muscles
- A. Smooth muscles
- B. Cardiac muscles
- C. Skeletal muscles
- D. Voluntary muscles
- E. Both A and C
Explanation
Cardiac muscles are striated muscles found exclusively in the walls of the heart. In contrast, smooth muscles are found in the walls of many organs and blood vessels, and skeletal muscles are attached to the bones and responsible for voluntary movements.
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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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