Syllabus Edition
First teaching 2015
Last exams 2025
Respiration
Written by: Alistair Marjot
Reviewed by: Bridgette Barrett
Respiration
What is respiration?
Respiration and photosynthesis can be described as processes with inputs, outputs, and transformations of energy and matter
Respiration is the conversion of organic matter into carbon dioxide and water in all living organisms, releasing energy
Aerobic respiration can be simply described as: glucose + oxygen → carbon dioxide + water
Aerobic respiration
Inputs: organic matter (glucose) and oxygen
Processes: oxidation processes inside cells
Outputs: release of energy for work and heat
Transformations: stored chemical energy is transformed into kinetic energy and heat
During respiration, large amounts of energy are dissipated as heat, increasing the entropy in the ecosystem while enabling the organisms to maintain relatively low entropy/high organisation
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