Question

What is double circulation? Draw its flow chart.

Answer 1

Double circulation:

1. The circulation of blood that occurs twice to the heart is called double circulation.
2. This type of circulation is unique in four-chambered organisms.
3. Aves and mammals undergo this type of double circulation.
4. It involves two circuits to circulate the blood to the heart.
5. The two main circulatory routes are the systemic and pulmonary circulations.

Systemic Circulation:

1. It supplies blood flow to all the tissues of the body except the lungs.
2. The left ventricle of the heart releases blood into the aorta, which carries it to all of the body's organs and tissues before returning it to the right atrium.

Pulmonary circulation:

1. It carries oxygen-depleted blood from the right ventricle to the alveoli within the lungs and returns oxygen rich blood from the alveoli to the left atrium.
2. Oxygen-depleted blood is transported to the lungs by pulmonary arteries, while oxygen rich blood is sent from the lungs to the left atria by pulmonary veins.

The flow chart of the double circulation is given below: