Circulatory Systems
How Blood works in your System
Most Important & Very Interesting Mechanism of human Living
THE CIRCULORY SYSTEM
The circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it. Oxygen-rich blood leaves the left side of the heart and enters the biggest artery, called the aorta. The aorta branches into smaller arteries, which then branch into even smaller vessels which travel all over the body. When blood enters the smallest blood vessels, which are called capillaries and are found in body tissue, it gives nutrients and oxygen to the cells and takes in carbon dioxide, water and waste. The blood, which no longer contains oxygen and nutrients, then goes back to the heart through veins. Veins carry waste products away from cells and bring blood back to the heart, which pumps it to the lungs to pick up oxygen and eliminate waste carbon dioxide.
Think of you circulatory system as a packed string of interstate highways: every vehicle on the road has a very specific and helpful function. So long as no one starts backing up traffic, everyone gets where it needs to go in an orderly fashion, otherwise?
