O LevelBiologyCambridgeTopic Questions13. Excretion in Humans13.1 Excretion

Excretion (Cambridge O Level Biology)

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1
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What is urea produced from?

  • Fatty acids

  • Glucose

  • Amino acids

  • Glycerol

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Which of the following is a correct example of excretion in mammals?

  • The production of carbon dioxide from aerobic respiration.

  • The removal of excess salts from the blood.

  • The removal of undigested food from the anus.

  • The release of hormones from glands.

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Which row of the table below correctly displays the correct roles of the following organs in processing waste in the human body?

  kidneys liver lungs
A excretes urea excretes amino acids removes carbon dioxide
B removes carbon dioxide deamination of amino acids excretes urea
C removes urea from blood deamination of amino acids removes carbon dioxide
D excretes urine deamination of urea removes carbon dioxide

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To remain healthy, a person must be able to excrete a number of waste products produced as a result of metabolism.

A list of excretory products is given below.

Which of the following would be lost from both the kidneys and lungs?

  • Water

  • Carbon dioxide

  • Glucose

  • Urea

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Which of the following organs are responsible for removing excretory products from the blood?

  • Bladder and kidneys

  • Kidneys and lungs

  • Lungs and liver

  • Bladder and liver

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