Question

circulation of blood through heart describe in 50 lines

Answer 1

the blood circulatory system delivers nutrients and oxygen to all cells in body . consist of heart and blood cells running through the entire body .the arteries carry blood away from the heart ; then the veins carry back to the heart . the system of blood vessels resembles a tree : the main artery ( Arora ) , branches into large arteries which lead to smaller and smaller vessels . the smallest artery end in a network of tiny vessels , the capillary network .



blood circulation starts when the heart relaxes between two heartbeats . the blood flows from atriainto the ventricles which then expand . the following phase is called Ejection period , which is when both ventricles pump the blood into the large arteries .