Question

What is the structure of the heart

Answer 1

The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane.

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Answer 2

Answer:

the human heart is four chambered muscular organ, shaped and sized roughly like a man's closed first with two -third of mass to the left of midline . the heart is enclosed in pericardial sac that is lined with the parietal lays of serious membrane .