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So I tried adding more info in my answers, this is what I ended up with:

What parts make up the circulatory system?
The circulatory system is made up of vessels and muscles that help control the flow of the blood around the body.The system is divided into 3 major parts. Those parts are the heart, the blood and the blood vessels. There are 3 types of blood vessels and they are arteries, capillaries and veins. The arteries are used to carry rich-oxygen blood away from the heart and then provide it to tissues, and then it returns the blood cells back to the heart through the veins for reoxygenation. With all these things happening within the body, this is known as a circulation which is how it got the name “Circulatory system”


Why do we need it?
The circulatory system helps us, as it provides our body cells with all the oxygen and nutrients it needs. If our body cells did not have enough oxygen and nutrients, we humans would not be able to survive. Waste like carbon dioxide is also removed by the circulatory system and it is replaced with fresh oxygen that we have breathed in through our lungs. The human circulatory is a system of vessels that distribute blood throughout our entire body. In the middle of the circulatory system is our heart which circulates blood throughout the veins and arteries, we need blood because its one of the most important things humans need to live off. So without this system we would have no blood in our bodies, we would not get all the nutrients and oxygen we need to survive, we would’ve been living with no heart (which is impossible and you would die straight away) and we would also have a lot of waste in our bodies that could possibly cause death.

I think my answer for the question "What parts make up the system?" is too short but im having trouble researching more info about what parts make up the circulatory system. Even though there are some info, I dont understand what it means . ahahah (: .. i'm still looking for a site that will explain the different parts of the system more simple for me to understand . For now, its pretty hard to find a simple website that will explain the different parts of the system more clearly .
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