IGCSE Biology Paper-3: Specimen Questions with Answers 349 - 350 of 358

Passage

Excretion is the process of removing waste products of metabolism from the body.

Question 349 (6 of 7 Based on Passage)

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The liver is another excretory organ of the body. The liver breaks down hormones and drugs, such as alcohol.

(i) State one function of the liver other than the breakdown of hormones and drugs.

Explanation

  • Production of bile, which helps carry away waste and break down fats in the small intestine during digestion
  • Production of certain proteins for blood plasma
  • Conversion of excess glucose into glycogen for storage
  • Processing of hemoglobin for use of its iron content (the liver stores iron)
  • Regulating blood clotting

Question 350 (7 of 7 Based on Passage)

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Name the two main products of metabolism that need to be excreted from the human body.

Explanation

Main Excretory Organ in Human is Kidney

The excretory products include amino acids, urea, uric acid, carbon dioxide, water, and ammonia.

Other excretory organs are:

  • Skin: The skin is the largest organ in the body. Skin excretes sweat which eliminates compounds like NaCl, some amount of urea etc.
  • Lungs: Lungs are the primary respiratory organs. By process of gaseous exchange, they also eliminate some amount of water in the form of vapor.
  • Liver: This organ has an important function in excreting waste from the body. Liver eliminates excess fats and cholesterol. This is essential to maintain the health of the body.

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