Question

Explain the flow of blood in double circulatory system

Answer 1

Double circulation systems deliver greater blood flow rate to tissues around the body because the heart pumps the (oxygenated or 'oxygen-rich') blood returned to it from the lungs. This is useful because whenblood passes through the lungs its pressure is reduced.

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Answer 2

In a double circulatory system there are two circuits for blood passing through the heart:

Pulmonary Circulation
Deoxygenated blood is pumped from the heart to the lungs, oxygenated blood returns to the heart from the lungs.

Systemic Circulation
Oxygenated blood is pumped from the heart around the body (including all the organs). That blood returns to the heart deoxygenated (more accurately 'oxygen poor') because much of the oxygen it contained when it left the heart has been supplied to tissues in the body.

In animals that have double circulation(blood circulation) systems, the animal's heart has more than two chambers, e.g.

Fish

Single Circulation
(Two-chambered heart)

Frogs, Lizards

Double Circulation
(Three-chambered heart)

Mammals, Birds

Double Circulation
(Four-chambered heart)