2 marksThe urinary system is responsible for the process of excretion.
Define the term excretion.
3 marksCarbon dioxide is one of the substances that is excreted by the body.
Explain the importance of excreting carbon dioxide.
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2 marksExcretion is the removal of toxic substances or substances in excess, from the body.
Excess water is excreted from the lungs and the kidneys.
State the name of one other substance that is excreted from
3 marksThe volume and concentration of urine varies with changing conditions.
Table 1 shows three changing conditions.
Write increase or decrease in each of the boxes in Table 1 to show how each change affects the volume and the concentration of urine.
Table 1
| changing condition | volume of urine | concentration of urine |
| increase in water intake | ||
| increase in temperature | ||
| increase in exercise |
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