In which of the following vertebrate group/groups, does the heart not pump oxygenated blood to different parts of the body?
(A) Pisces and amphibians
(B) Amphibians and reptiles
(C) Amphibians only
(D) Pisces only
Answer
The members belonging to the class pisces have gills which are responsible for respiration .
- Since these animals have only 2 chambered hearts , the gills directly pump oxygenated blood to different parts of the body.
- The deoxygenated blood comes to the heart which pumps it to the gills to be oxygenated again.
- Other species like amphibians and reptiles have 3 chambered hearts which exhibit double circulation, meaning the heart pumps oxygenated as well as deoxygenated blood to its destination in different parts of the body.
So, the correct answer is (d) Pisces only
