Question

Describe Double Circulation of the heart with a diagram.

Answer 1

When blood goes through the heart twice during each cycle i.e. the blood passes through the human heart two times to supply once to the whole body. So, it is called Double Circulation of blood.........

Answer 2

The double circulatory system of blood flow refers to the separate systems of pulmonary circulation and the systemic circulation in amphibians, birds and mammals (including humans.) In contrast, fish have a single circulation system because they do not have lungs. All animals with lungs have a double circulatory system.

Double circulation has two routes or circuits.

Heart—lung—heart(pulmonary circulation)
Heart—body—heart(systemic circulation)

The right ventricle pumps the blood throughout pulmonary artery to the lungs for purification. After being purified, the blood returns to the left auricle through the pulmonary vein. From here the blood comes to the left ventricle and then from here it is pumped to the arteries to the rest of the body. The impure blood then returns to the right auricle and then goes to the right ventricle.