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

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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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.

Question 345 (2 of 7 Based on Passage)

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The kidney is one of the main excretory organs of the body. Its role is to filter the blood. Some substances leave the blood and are removed from the body in the urine. The concentration of protein in the blood entering the kidneys in the renal arteries is 83 g dm – 3.

State the concentration of protein that you would expect in the urine of a healthy person and explain your answer.

concentration … g dm – 3

Explanation

Protein in Urine

Concentration

Diagram of Urine

Components of Urine

Urea and Creatinine