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Excretion
Learning objective(s)
Explain the importance of removing metabolic wastes from the body, including
carbon dioxide and nitrogenous waste
Why must metabolic wastes be removed?
Carbon dioxide
Excess carbon dioxide is toxic. A high level of carbon dioxide has three main effects:

The majority of CO 2 is carried in…

Page 2

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Questions
1. Explain the difference between excretion and egestion.
Excretion is the removal of metabolic waste from cell processes. Egestion is the removal of
undigested food from the digestive system ­ it has never been in a body cells so it cannot
be classified as excretion.
2. Explain what causes…

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