Aerobic Respiration: The Main Energy Pathway

🔬 Aerobic Respiration: The Main Energy Pathway

Aerobic respiration is the primary way your cells release energy from glucose. It requires oxygen and takes place in the mitochondria — the organelles often called the "powerhouses" of the cell.

The word equation is:

glucose + oxygen → carbon dioxide + water (+ energy)

The balanced symbol equation is:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

Aerobic respiration is an exothermic reaction — it releases energy to the surroundings. This is why your body temperature rises during exercise. The energy released is used to make ATP, which cells use to power processes like muscle contraction, active transport, protein synthesis, and nerve impulse transmission.

Mitochondria are most abundant in cells with high energy demands, such as muscle cells, liver cells, and sperm cells. If a question asks "why does cell X have many mitochondria?", the answer always links back to a high rate of aerobic respiration.