What is Respiration? Definition, Meaning & Example
The biochemical process by which organisms break down food molecules to release energy in the form of ATP.
TL;DR: The biochemical process by which organisms break down food molecules to release energy in the form of ATP.
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Respiration: The biochemical process by which organisms break down food molecules to release energy in the form of ATP.
Explanation
Respiration is essential for life and occurs in all living cells. Aerobic respiration, which uses oxygen, occurs in mitochondria and produces the most energy from glucose. Anaerobic respiration happens without oxygen and is used by bacteria and during intense muscle exercise. In humans, glucose is broken down to produce water, carbon dioxide, and approximately 38 ATP molecules per glucose. This energy is used for all life processes including movement, growth, and heat production.
Example
When you eat food and your body breaks down glucose with oxygen, energy is released to power your muscles when you run, think, or study for exams.
Frequently Asked Questions
Why do we breathe oxygen?
We breathe oxygen because our cells use it during aerobic respiration to break down glucose and release energy.
What happens during respiration in your mitochondria?
Glucose is oxidized step by step, releasing energy that is captured in ATP molecules, and carbon dioxide is produced as a waste product.
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