Question

in which of the following vertebrategroup/groups, heart does not pump oxygenated blood to different parts of the body

Answer 1

Answer:

Pisces only

Fishes have closed but a single circulatory system. In a closed circulatory system, blood is contained inside blood vessels and circulates unidirectionally from the heart around the systemic circulatory route, then returns to the heart again. Fish have a single circuit for blood flow and a two-chambered heart that has only a single atrium and a single ventricle. The atrium collects blood that has returned from the body and the ventricle pumps the blood to the gills where gas exchange occurs and the blood is re-oxygenated; this is called gill circulation. The blood then continues through the rest of the body before arriving back at the atrium; this is called systemic circulation. This unidirectional flow of blood produces a gradient of oxygenated to deoxygenated blood around the fish's systemic circuit. The result is a limit on the amount of oxygen that can reach some of the organs and tissues of the body, reducing the overall metabolic capacity of fish.

So the answer is- 'Pisces only'.

I hope this answer helps you