Question

Explain the structure of human heart

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Answer 1

Answer:

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

$\Large\bf\green{Answer:-}$

The heart is a strong muscular organ that circulates and pumps about, 75001 blood each day and contracts and expands about 100.000 times per day. The normal only as big as an average clenched fist and sits behind the breast bone, or sternum, slightly the left in between the lungs. The heart is surrounded by a double-walled membrane the pericardium. The pericardium is a fibroserous sac that encloses the heart and the re the large vessels. Between the two layer of pericardium lies pericardial fluid that r friction when the heart contracts. It also protects the heart from shocks and injuries.

Blood vessels leave and enter the heart and help to keep it in position. The internal structure of the heart consists of four hollow spaces or chambers, divided by a tissue wall called the cardiac septum, The flow of blood through the heart is regulated by four valves.

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