Out of 3 respiratory substrate (carbohydrates, fat and protein), which one is the most favoured substrate -

Options

A. Glucose
B. Protein / amino acid
C. Fat / fatty acid
D. All

Answer

**Step-by-Step Text Solution:**

1. **Identify the Respiratory Substrates**: The three main respiratory substrates are carbohydrates, fats, and proteins.

2. **Determine the Order of Preference**: Among these substrates, carbohydrates are the most favored for respiration.

3. **Explain the Reasoning**: Carbohydrates, particularly glucose, are the primary source of energy for most organisms. They are readily available and easily metabolized to produce ATP (adenosine triphosphate), which is the energy currency of the cell.

4. **Discuss the Usage of Other Substrates**: Once carbohydrates are depleted, the body will start to utilize fats as the next source of energy. Proteins are generally used as a last resort when both carbohydrates and fats are unavailable.

5. **Conclude with the Most Favored Substrate**: Therefore, the most favored respiratory substrate is carbohydrates, specifically glucose, which is transported through the blood to all cells in the body for energy production.