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O Level Biology: Transport in Humans MCQs — Biology (page 2)

29 multiple-choice questions on O Level Biology: Transport in Humans from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. In a double circulation, blood passes through the heart

  1. three times
  2. twice for each complete circuit
  3. once for each circuit
  4. only when exercising

Answer: B) twice for each complete circuit

Explanation: Double circulation = heart twice per circuit. O Level Biology · Topic 11 Transport in Humans · 11.1 Circulatory system

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27. Which component of blood transports oxygen?

  1. Red blood cells
  2. Plasma
  3. Platelets
  4. Lymphocytes

Answer: A) Red blood cells

Explanation: Haemoglobin in red cells carries oxygen. O Level Biology · Topic 11 Transport in Humans · 11.4 Blood

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28. Veins have a wide lumen because

  1. they need to exchange gases
  2. they have no valves
  3. they carry blood at high pressure
  4. the blood is at low pressure, so less resistance helps flow

Answer: D) the blood is at low pressure, so less resistance helps flow

Explanation: Wide lumens reduce resistance. O Level Biology · Topic 11 Transport in Humans · 11.3 Blood vessels

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29. The semilunar valves are found

  1. in the vena cava
  2. at the base of the aorta and pulmonary artery
  3. between atria and ventricles
  4. in capillaries

Answer: B) at the base of the aorta and pulmonary artery

Explanation: Semilunar valves guard the arteries leaving the heart. O Level Biology · Topic 11 Transport in Humans · 11.2 Heart

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