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Question
Why is blood needed by all the parts of a body?
Solution 1
- Blood carries oxygen, food, hormones and other essential substances to different parts of the body.
- It brings carbon dioxide and other excretory substances from different parts of the body and expels them with the help of the lungs and other excretory organs.
- It sends toxic and harmful substances formed in metabolism to the liver to make them harmless. Thus, all organs need blood.
Solution 2
- Blood is needed by all the parts because it contains the digested food and oxygen in it.
- It supplies oxygen and digested food to various parts of the body to provide essential energy to them which helps the body to perform various functions.
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