The Circulatory System

The circulatory system is an extremely important part of your body. This system transports blood throughout your body. At any given time, your body has five liters of blood flowing through it. The heart, the lungs, and the blood vessels all play an active role in blood flow.

Over the course of a person’s life, the heart beats about 3 billion times. That is a lot of very important beats. The beating of the heart means that blood is being sent to the body. The heart is a muscle. It is a very strong muscle. It is divided into four main parts. The blood leaves the heart and enters the aorta. Fresh blood from the aorta goes to the brain.

The brain needs the oxygen in the blood. The brain could not live without this. Blood also travels through the lungs. Carbon dioxide is taken out and oxygen is put in its place. The arteries and veins take the blood to all parts of the body. The blood returns back to the heart through the veins.

You can hear your heart pumping blood in your body by using the stethoscope. One end of this tool is placed on your heart, and the earpieces go in your ears. The stethoscope works like a mini microphone so that you can hear the heart beating.