Biology unit 2 topic 4

Created by: Rachel12341
Created on: 10-05-14 18:24

Aerobic respiration

uses oxygen & glucose to release energy, releasing CO2 and water. Most of the chemical reactions of aerobic respiration takes place in the mitochondria.

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The energy released can be used to build larger molecules from smaller ones, maintain body temperature, enabling muscle muscle contraction in animals, building sugars, nitrates and other nutrients into amino acids and then proteins in plants

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When you exercise:

Heart rate increases+blood vessels supplying the muscles dilate(widen)allowing more blood to reach muscles.Breathing rate+depth of each breath increases allowing a greater uptake of oxygen and release of CO2.Stored glycogen converted back to glucose

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Anaerobic respiration

when exercising over a long time, muscles get fatigued, when your muscles cant get enough oxygen for aerobic respiration, they respire anaerobically. The glucose is not completely broken down and lactic acid is produced.

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Anaerobic respiration is inefficient because…

the breakdown of glucose is not complete. Instead of CO2 & water produced, lactic acid is. This causes muscle fatigue& when finished exercising, must be broken down by taking in oxygen (repaying the ‘oxygen debt’) into CO2 and water

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