The human body has an organ A which acts as a pump. The organ A pumps a liquid B into the whole body continuously. The liquid B supplies the useful substances C and D to all the body cells and removes a waste E from the body cells.
1. What are organ A and liquid B?
2. What is the colour of liquid B and why?
3. Name the useful substances C and D.
4. What is the waste E?
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Heart
Explanation:
- The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system.
- The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbondioxide to the lungs.
- Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those cells.
- In vertebrates it is composed of blood cells suspended in blood plasma.
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