Maddi's+text+type

= = =media type="custom" key="10403206" = = = =The circulatory system is made of up of the vessels and muscles that help control the flow of the blood around the body. This process is called circulation. The main parts of the system is the heart and veins. = = = = The blood circulates using the heart. The heart is the main part that pumps the blood around the body. There are two types of blood vessels, arteries which take blood away from the heart and veins which return blood to the heart.The arteries are red this is because they have lots of oxygen in them. The veins are blue because they dont have as much oxygen in them. = = Before each beat, your heart fills with blood. Then its muscle pumps to squirt the blood along. When the heart pumps, it squeezes. Your heart does this all day and all night, all the time. =

The circulatory system is a very important part of the body without it we wouldn't be able to have blood in our body and our heart wouldn't pump.


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