The human body has an organ A which acts as a pump. The pump 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.
What is the waste E?

Options

A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. None of these

Answer

To solve the question, we need to identify the components mentioned in the problem:

1. **Identify the organ A**: The organ that acts as a pump in the human body is the heart. The heart pumps blood throughout the body.

2. **Identify the liquid B**: The liquid that is pumped by the heart is blood. Blood circulates through the body, delivering essential substances to cells and removing waste products.

3. **Identify the useful substances C and D**:
- Substance C can be identified as nutrients, which are derived from the food we eat and are essential for the body's functioning.
- Substance D is oxygen, which is crucial for cellular respiration and energy production in cells.

4. **Identify the waste E**: The waste product that needs to be removed from the body cells is carbon dioxide. Carbon dioxide is produced as a byproduct of cellular respiration when cells utilize oxygen to generate energy.

Putting it all together, the waste E that is removed from the body cells is carbon dioxide.

**Final Answer**: The waste E is carbon dioxide.

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