Question

(a) How many chambers are present in heart of (1) fish (2) ampphibians ? (b) why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds

Answer 1

The fish heart has two chambers, an atrium and a ventricle. Blood enters the atrium after circulating through the fish, leaving it poorly oxygenated. The blood is then pumped into the ventricle. From the ventricle the blood passes onto the gills where it becomes oxygenated and then circulates through the fish before beginning the circuit again.

Amphibians have three chambered heart. It has two auricles and one ventricle. Therefore, in amphibians, oxygenated blood and deoxygenated blood mixes up. So, they are cold blooded animals and there body temperature changes with the temperature change in surrounding.

Mammals and birds are warm blooded animals. They constantly use energy to maintain their body tmperature unlike the cold blooded animals.. They have higher energy need and so htey require more oxygen to produce energy. Thus it is important that their oxygenated blood does not get mixed up with deoxygenated blood.

Answer 2

Answer:

amphibian are 3 chambered

while prices 2 chambered heart