Question

What is double circulation? Draw the flowchart to show the exchange of gasses in mammals. Which class of vertebrates does not have double circulation?

This is a 15 points question so answer correctly ​

Answer 1

Answer:

Double circulation is a process during which blood passes twice through the heart during one complete cycle. ... However, it is more prominent in birds and mammals as in them the heart is completely divided into four chambers – the right atrium, the right ventricle, the left atrium, and the left ventricle.

As such, amphibians have a double circulatory system composed of two circuits. ... In general, a circulatory system transports blood with oxygen and nutrients to cells, it picks up waste products from the cells to be moved out of the body, and it takes de-oxygenated blood back to the lungs. Mammals and birds have a complete double circulatory system allowing oxygenated and deoxygenated blood to flow separately from each other within the heart.

Answer 2

Explanation:

Double circulation:: The blood flows twice through the heart and it is called double circulation. 1) The blood from all body parts is brought to right auricle which pumps it into right ventricle. Fron right ventricle blood is pumped to lungs (through pulmonary artery)for oxygenation.