O Level Biology: Transport in Humans MCQs

Question 1

Coronary heart disease is caused by

Accepted Answer

blockage of the coronary arteries

Answer

weak valves

Answer

a hole in the septum

Answer

low blood sugar

Question 2

Which blood vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Answer

Vena cava

Answer

Aorta

Answer

Pulmonary artery

Question 3

Which vessels contain valves?

Accepted Answer

Veins

Answer

Capillaries

Answer

The aorta only

Answer

Arteries

Question 4

Which vessel carries blood from the gut to the liver?

Accepted Answer

Hepatic portal vein

Answer

Hepatic artery

Answer

Renal vein

Answer

Hepatic vein

Question 5

Why are the ventricle walls thicker than the atria walls?

Accepted Answer

Ventricles pump blood out of the heart over a longer distance

Answer

Ventricles hold less blood

Answer

Atria pump blood to the body

Answer

Atria have valves

Question 6

During blood clotting,

Accepted Answer

soluble fibrinogen is converted to insoluble fibrin

Answer

fibrin is converted to fibrinogen

Answer

red cells make antibodies

Answer

plasma becomes solid

Question 7

Capillary walls are one cell thick so that

Accepted Answer

substances diffuse quickly

Answer

they do not burst

Answer

blood can flow fast

Answer

pressure stays high

Question 8

Which substance is NOT transported in plasma?

Accepted Answer

Oxygen bound to haemoglobin

Answer

Glucose

Answer

Urea

Answer

Hormones

Question 9

Arteries have thick, muscular, elastic walls because they

Accepted Answer

carry blood at high pressure

Answer

exchange substances with cells

Answer

carry blood at low pressure

Answer

contain valves

Question 10

Which vessel carries blood from the kidney?

Accepted Answer

Renal vein

Answer

Aorta

Answer

Hepatic vein

Answer

Renal artery

Question 11

Lymphocytes

Accepted Answer

produce antibodies

Answer

clot blood

Answer

engulf pathogens

Answer

carry oxygen

Question 12

Platelets are involved in

Accepted Answer

blood clotting

Answer

antibody production

Answer

oxygen transport

Answer

digestion

Question 13

The function of the septum is to

Accepted Answer

prevent oxygenated and deoxygenated blood mixing

Answer

stop backflow into the atria

Answer

pump blood to the lungs

Answer

supply the heart with oxygen

Question 14

Which method monitors the electrical activity of the heart?

Accepted Answer

ECG

Answer

Stethoscope

Answer

Blood test

Answer

Pulse rate

Question 15

The circulatory system keeps blood flowing in one direction because of

Accepted Answer

valves

Answer

plasma

Answer

capillaries

Answer

platelets

Question 16

Which circulation carries blood between the heart and the lungs?

Accepted Answer

Pulmonary circulation

Answer

Hepatic circulation

Answer

Systemic circulation

Answer

Renal circulation

Question 17

Which vessels supply the heart muscle with oxygen?

Accepted Answer

Coronary arteries

Answer

Pulmonary veins

Answer

Hepatic arteries

Answer

Vena cava

Question 18

Why is blood sent to the lungs at low pressure?

Accepted Answer

To avoid damaging lung capillaries and allow gas exchange

Answer

So that it goes faster

Answer

Because veins are weak

Answer

Because the lungs are far from the heart

Question 19

When the ventricles contract, the atrioventricular valves

Accepted Answer

close to stop blood flowing back into the atria

Answer

stay open

Answer

open to let blood into the atria

Answer

close the aorta

Question 20

Tissue fluid forms when

Accepted Answer

pressure forces plasma out of capillaries

Answer

veins leak

Answer

platelets burst

Answer

red cells leave the blood

Question 21

Which is a risk factor for coronary heart disease?

Accepted Answer

Smoking

Answer

Eating fruit

Answer

A diet low in saturated fat

Answer

Regular exercise

Question 22

Which chamber of the heart has the thickest wall?

Accepted Answer

Left ventricle

Answer

Left atrium

Answer

Right atrium

Answer

Right ventricle

Question 23

Phagocytes

Accepted Answer

engulf and digest pathogens

Answer

produce antibodies

Answer

form fibrin

Answer

carry carbon dioxide

Question 24

Heart rate increases during exercise because muscles need

Accepted Answer

more oxygen and glucose and to remove more CO₂

Answer

more lactic acid

Answer

less oxygen

Answer

less blood

Question 25

Which white blood cell has a lobed nucleus and engulfs bacteria?

Accepted Answer

Phagocyte

Answer

Red blood cell

Answer

Platelet

Answer

Lymphocyte

O Level Biology: Transport in Humans MCQs — Biology

1. Coronary heart disease is caused by

2. Which blood vessel carries oxygenated blood from the lungs to the heart?

3. Which vessels contain valves?

4. Which vessel carries blood from the gut to the liver?

5. Why are the ventricle walls thicker than the atria walls?

6. During blood clotting,

7. Capillary walls are one cell thick so that

8. Which substance is NOT transported in plasma?

9. Arteries have thick, muscular, elastic walls because they

10. Which vessel carries blood from the kidney?

11. Lymphocytes

12. Platelets are involved in

13. The function of the septum is to

14. Which method monitors the electrical activity of the heart?

15. The circulatory system keeps blood flowing in one direction because of

16. Which circulation carries blood between the heart and the lungs?

17. Which vessels supply the heart muscle with oxygen?

18. Why is blood sent to the lungs at low pressure?

19. When the ventricles contract, the atrioventricular valves

20. Tissue fluid forms when

21. Which is a risk factor for coronary heart disease?

22. Which chamber of the heart has the thickest wall?

23. Phagocytes

24. Heart rate increases during exercise because muscles need

25. Which white blood cell has a lobed nucleus and engulfs bacteria?

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