Which organelle is the powerhouse of the cell where aerobic respiration occurs and energy is produced?

• A. Haemoglobin
• B. Myoglobin
• C. Mitochondria
• D. Oxyhaemoglobin Dissociation

Answer: (C)

The mitochondria are the site where aerobic respiration happens and energy (ATP) is produced. Often called the powerhouse of the cell, they host the processes that convert glucose and oxygen into ATP through glycolysis (in the cytoplasm), the citric acid cycle, and oxidative phosphorylation. This is what powers cellular activities, including muscle contraction during PE activities.

Haemoglobin carries oxygen in the blood, but doesn’t generate energy. Myoglobin stores and releases oxygen within muscles, not the energy-producing site. Oxyhaemoglobin dissociation describes how oxygen detaches from hemoglobin, not where energy is produced.