Pls answer theses guys 1. What 3 main structures make up the CIRCULATORY system in humans?
2. What role does the heart play in the circulatory system (compare it to an object that is man-made)?
3. How does the heart's structure help to do its job? Explain what the sound the heart makes.
4. What are the 4 components that make-up everyone's blood? What does each component do for our bodies?
5. What are the 8 different types of blood that all humans have?

1. The heart, arteries, and veins

2. The heart pumps blood and nutrients around the body

3. Your heart is a muscular organ, roughly the size of your fist. It works as a pump to push blood through your arteries with enough force for blood to reach all parts of your body. It is small organ for the big and important job is must do. The heart’s structure is what enables it to function as such an efficient pump.

4. Plasma- main component of blood

Red blood cells- carry oxygen/ carbon dioxide

White blood cells- part of the immune system, help with immune response

Platelets- responsible for blood clotting

5. I didnt really know this one but when i looked it up it talks about blood types, and these are the eight different ones. (A+, A-, B+, B-, O+, O-, AB+, AB-)

Explanation:

because no

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