All living organisms require few fundamental elements like food, water and air to support their life. On a daily basis, we ensure these elements by eating, drinking and breathing. But, how are these transported from one place to another in our body? Here we will learn about a circulatory system and heart which helps in the transportation of food and other requirements to different parts of the body.
Circulatory system, as the name suggests it is a system which circulates everything throughout the body. In order to circulate something we need a messenger and messenger needs a pathway to follow. Moreover, there will be a center which sends messages. The circulatory system of a human body works on this principle.
Blood is a fluid present in our body which circulates food, water and air to various body parts. Blood travels through a defined set of tracks called blood vessels. The main center which pumps blood is our heart.
Blood is the most abundant body fluid which transports food, oxygen and other substances to various parts of the body. Other than transportation blood has the role of defense also. The composition of blood includes plasma, blood cells, proteins and salts.
- Plasma, fluid part of blood.
- Blood cells, solid part of blood. There are three types of blood cells.
Blood vessels are the pathways in which blood travels to different body parts. There are two pathways one which carries oxygenated (oxygen-rich) blood and other carries deoxygenated blood (carbon dioxide rich) blood. Blood vessels which transport oxygenated blood are called arteries. Blood vessels which transport deoxygenated blood are called veins.
A heart is a fist-sized organ located in the chest slightly towards left. Despite its size, the heart is a very crucial organ of a body. It works hours non-stop. Mixing of oxygenated blood and deoxygenated blood is resolved by four chambers of the heart. Two atria and two ventricles together called the four chambers of the heart. Atria are upper chambers whereas ventricles are lower chambers.
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