IGCSE Biology Paper-3: Specimen Questions with Answers 344 - 345 of 358

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Passage

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

Question 344 (1 of 7 Based on Passage)

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Short Answer▾

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 345 (2 of 7 Based on Passage)

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Short Answer▾

Dialysis can be used to treat people whose kidneys do not function properly.

Fig. shows dialysis treatment.

Movement of Substance

Use Fig. to describe the process of dialysis and explain changes that occur in a person՚s blood.

Explanation

It is used to remove urea and creatinine. In such patients the blood is drained out through an artery into a ‘dialyzing unit’ after adding heparin, an anticoagulant. The dialyzing unit contains a coiled cellophane tube, surrounded by dialyzing fluid. This fluid has same composition as plasma except the nitrogenous wastes. The nitrogenous wastes from the blood pass through cellophane membrane into the dialyzing fluid and the blood is cleared of waste substances. The cleared blood, after addition of anti-heparin, is pumped back into the body through a vein.

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