Question

Hi , can you please help me in these-How arteries are distributive and veins are collective in nature?AND Which organisms have double circulation?What is the need of double circulation in them?​

Answer 1

1. Arteries transport blood away from the heart. Veins return the blood back toward the heart. Capillaries surround body cells and tissues to deliver and absorb oxygen, nutrients, and other substances. The capillaries also connect the branches of arteries and to the branches of veins.
2. Double circulation pathways are found in birds and mammals.
3. Double circulation in human beings allows the separation of oxygenated and deoxygenated blood in the body. It helps in maintaining the high blood pressure required for essential processes. It enables pure blood to reach the different tissues and organs of the body like kidneys, liver, etc.

hope this helped you. :)