Question

Which of the following statements correctly describes respiratory substrates?

• A. Substances which do not produce energy
• B. Substances which are broken down during respiration
• C. Substances which are excreted out of the body
• D. All of these

Answer 1

The correct option is B Substances which are broken down during respiration

Respiratory substrates are those organic substances that are broken down during respiration to liberate energy inside the living cells. The common respiratory substrates are carbohydrates, fats, proteins and organic acids. The carbohydrates are the most common respiratory substrates. The proteins are used as respiratory substrates when the body is starving.