Question

Human heart is more efficient than the heart of fish?

Answer 1

Human heart is more efficient than the heart of fish because the heart of fish has a simple anatomic structure compared to human heart.

Thus human heart performs double circulation of blood through two ventricles and two atriums.

Whereas the fish has one ventricle and one atrium and therefore can’t perform double circulation.

Answer 2

Yes.

Fish have the simplest (single) circulatory system: blood flows from a two-chambered heart (atrium and ventricle) through the gills where oxygen is absorbed from the water, and carbon dioxide is released. The oxygenated blood then flows directly onwards to the rest of the body. In the tissues oxygen is removed, known as de-oxygenation and carbon dioxide, one endproduct of metabolism, is transferred to the blood.

Mammals and birds have a heart with four chambers that completely separate the oxygenated and deoxygenated blood- it pumps oxygenated blood through the body and deoxygenated blood only to the lungs.