Question

Heart is made up of-
(a) muscles
(c) both (a) and (b)
E
(b) bones
(d) none of these​

Answer 1

The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium. The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node.

Answer 2

Answer:

a) Muscles

Explanation:

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