Question

What animals have single circulation?

Answer 1

Single circulation:

1. Single circulation is when blood flows only once through the heart.
2. It leads to the mixing of the oxygenated and the deoxygenated blood.
3. Fishes have single circulation.
4. They have a two-chambered heart comprising an atrium and a ventricle.
5. In fishes, the heart pumps out the deoxygenated blood which undergoes oxygenation in the gills.
6. The oxygenated blood is then passed to the body parts from where the deoxygenated blood is returned to the heart.