Which one of the following animals has two separate circulatory pathways? (NEET-2015 RE) a. Lizard b. Whale c. Shark d. Frog
Option B.Double circulation (double circulatory systems) are circulation systems in which blood flows through the heart twice. In the case of double circulation, pulmonary circulation - i.e., blood flow between the heart and lungs, is separate from systemic circulation - i.e., movement of blood from the heart through the rest of the body (excluding the lungs), then back to the heart. Double circulation pathways are found in birds and mammals. Whale being a mammal has two separate circulatory pathways.
