The circulatory system is made up of the heart, blood vessels like the arteries, veins and capillaries. The body has two types of circulatory system. The pulmonary circulatory system is a network that goes from the heart to the lungs and then back again by the systemic circulation system. It is in these networks that the blood circulation to the various cells of the body takes place. So blood is carried to and fro on the pulmonary network.
The heart is the main organ for both the types of the circulatory system. The heart is a muscle and it is the hardest working muscle of the body. It works round the clock and pumps blood using its four chambers in the human body. The heart beats for about 60 to 100 times in a minute depending on the level of our body’s activity. Also, the heart can go much faster depending on the amount of blood that is required by the body.
The heart gets messages from various parts of the body as to how much energy I required by them to function. The heart reads the messages and alters the pumping speed accordingly. The entire human body is connected to the heart actually. So, the heart is central and core system of the circulatory system.
The veins, which are blood vessels, carry the deoxygenated blood into the hearty and then the heart adds oxygen to it. The oxygenated blood is then added with nutrients and supplied to the various cells of the body. This is a continuous process that takes place.
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