Question

What are the differences between circulatory system of a fish and a bird?

Answer 1

Dear Student

Fish have two chambered heart. Blood undergoes single circulation. Deoxygenated blood is pumped to gills for oxygenation. Oxygenated blood from gills is supplied directly to the body tissues without sending to the heart. Blood passes through the heart only once hence it is called as single circulation.
Bird have four chambered heart. Blood undergoes double circulation. Left side of the heart is filled with oxygenated blood and right side of the heart is filled by deoxygenated blood.

Regards