The process of respiration is concerned with

Options

A. liberation of oxygen
B. liberation of carbon dioxide
C. liberation of energy
D. intake of oxygen

Answer

### Step-by-Step Solution:

1. **Understanding Respiration**:
- Respiration is a vital process that occurs in living organisms. It involves the exchange of gases and the chemical breakdown of food to release energy.

2. **Physical Aspect of Respiration**:
- The physical part of respiration involves the exchange of gases, primarily oxygen and carbon dioxide.
- In humans, this exchange occurs in the lungs, where oxygen is inhaled and carbon dioxide is exhaled.
- Other organisms have different structures for gas exchange; for example, fish use gills, while frogs and earthworms can exchange gases through their skin.

3. **Chemical Aspect of Respiration**:
- The chemical aspect involves the digestion of food, which is then transported to cells where it is broken down to release energy.
- This process converts the energy stored in food into a usable form called ATP (adenosine triphosphate).

4. **Purpose of Respiration**:
- The primary purpose of respiration is to liberate energy from food. This energy is essential for various cellular processes and activities in the body.

5. **ATP as Energy Currency**:
- ATP is often referred to as the energy currency of the cell. It stores and provides energy for many biochemical reactions necessary for life.

6. **Conclusion**:
- Therefore, the process of respiration is concerned with the exchange of gases and the liberation of energy through the breakdown of food into ATP.