What are respiratory substrates? Name the most common respiratory substrate.

Explanation

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

1. **Definition of Respiratory Substrates:**
- Respiratory substrates are organic substances that are oxidized during the process of respiration. This oxidation process is essential for the release of energy within living cells.

2. **Function of Respiratory Substrates:**
- The primary function of these substrates is to provide energy. When they are oxidized, they release energy that is used by the cells for various metabolic processes.

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