Keshu

 It’s the process by which cells break down glucose (sugar) to release energy. This energy is used for all the activities in the body, like moving, growing, repairing tissues, and keeping warm.

There are two main types:

• Aerobic respiration: Needs oxygen.

• Anaerobic respiration: Happens without oxygen.

Aerobic Respiration – This is the main way our body gets energy. Glucose reacts with oxygen to produce carbon dioxide, water, and lots of energy (ATP). It mostly happens in the mitochondria of the cell.\

Mitochondria – These are called the “powerhouses of the cell” because most of the energy from aerobic respiration is produced here. They’re like tiny factories turning glucose into usable energy.

Anaerobic Respiration – This happens when there isn’t enough oxygen (like during intense exercise). It produces less energy and creates byproducts:

• In humans: lactic acid (can cause muscle cramps)

• In plants/yeast: ethanol + carbon dioxide