Respiration
Release energy by using glucose
Aerobic respiration uses oxygen
Anaerobic does not, it builds up an oxygen debt.
Aerobic respiration
Glucose + oxygen > Carbon dioxide + water
Happens in mitochondria in cells inside the cytoplasm
This reaction is controlled by enzymes.
The energy can also be used to build substances e,g, amino acids and protein.
The energy can also be used in mammals to keep body warm
Muscle cells respire more when they are exercising
Oxygen and glucose are needed more and needs to be delivered quickly.
Carbon dioxide needs to be removed quickly
Increasing the heart rate, breathing and depth of breathing allows this to happen.
This increase the rate of gas exchange in the lungs.
We can store glucose in our muscles as glycogen.
Anaerobic respiration
When we don't get enough oxygen, we use this process
This is the incomplete break down of glucose and releases around 5 % of the energy by aerobic.
This forms a waste product called lactic acid from glucose alone
Glucose > Lactic acid.
Muscles become tired after a long time of activity, they stop contracting efficiently as lactic build up form anaerobic respiration, the lactic acid can be removed by blood flow.
We oxidise lactic acid to carbon dioxide and water. As we exercise we cumilate and oxygen debt, this is the amount of oxygen needed to oxidise the lactic acid.
We continue to breath deeply and quickly after exercise as this happens
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