The blood circulatory system delivers nutrients and oxygen to all the cells in the body. it consists of the heart and the blood vessels running through the entire body, the arteries carry away blood from the heart, then the veins carry blood back to the heart. an example I found that was easier to understand was that The blood vessels system is like a tree, the trunk of a tree because the main artery the aorta branches into large arteries, which go into smaller and smaller vessels to the capillary. there are 2 types of blood circulatory systems the systemic circulation provides organs, tissues, and cells with blood so they get oxygen and other nutrients. then the pulmonary circulation is where the fresh oxygen we breathe enters the blood, at the same time carbon dioxide is released from the blood.
The circulation starts between two heartbeats when the blood flows from both atria into the ventricles. the following phase is called the ejection period which is when both ventricles pump blood into the main artery. The systemic circulation the left ventricle pumps blood into the main artery to larger and smaller arteries into the capillary's. then the blood releases oxygen nutrients and other important substances and takes on carbon dioxide and waste substances. the blood that is low in oxygen is collected into the veins and is traveled to the right atrium and then to the right ventricle.
Here is a diagram of what the circulation looks like.
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