Respiration - Chemical breakdown of nutrient molecules to yield energy [Enzyme controlled] Takes place in mitochondria and happens in all living cells

→ Requires oxygen

→ Doesn't require oxygen
→ Incomplete breakdown of glucose → Less energy released
→ Either in humans or yeast [Different products]
When exercising → greater demand for energy → Oxygen needed is more [But there isnt enough] → Anaerobic respiration
