Where does ETS occur in our body ?

Options

A. Cytoplasm
B. Mitochondrial matrix
C. Inner mitochondrial membrane
D. Outer mitochondrial membrane

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the Electron Transport System (ETS) occurs in the human body. ETS is a crucial part of aerobic respiration.

2. **Identifying the Options**: The options provided are:
- Cytoplasm
- Mitochondrial matrix
- Inner mitochondrial membrane
- Outer mitochondrial membrane

3. **Defining ETS**: The Electron Transport System (ETS) is also known as the electron transport chain. It is a series of protein complexes and other molecules that transfer electrons from electron donors to electron acceptors via redox reactions.

4. **Location of ETS**: The ETS specifically occurs in the inner mitochondrial membrane. This is where the proteins involved in the transport of electrons are located.

5. **Role of Products from Glycolysis and Krebs Cycle**: The products generated from glycolysis (ATP, NADH) and the Krebs cycle (NADH, FADH2) are utilized in the ETS to produce ATP through oxidative phosphorylation.

6. **Eliminating Incorrect Options**:
- **Cytoplasm**: Glycolysis occurs here, but not ETS.
- **Mitochondrial matrix**: This is where the Krebs cycle occurs, not ETS.
- **Outer mitochondrial membrane**: No significant reactions occur here related to ETS.

7. **Conclusion**: Based on the above analysis, the correct answer to the question is the **inner mitochondrial membrane**.

**Final Answer**: The Electron Transport System (ETS) occurs in the **inner mitochondrial membrane**.

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