_ of the heart is made up of special type of muscles, the cardiac muscles.
Correct answer: C. Myocardium
- A. Pericardium
- B. Epicardium
- C. Myocardium
- D. Endocardium
Explanation
Myocardium of the heart is made up of special type of muscles called cardiac muscles. These muscles contains myofibrils and myofilaments of myosin and actin. Their arrangement is similar to those in skeletal muscles fibres and their mechanism of contraction is essentially the same, except they are branched cells in which the successive cells are separated by junctions called intercalated discs.
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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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