Circulatory systems — Paper 2 · IGCSE Biology (9-1) 0970

17 The diagram shows a circulatory system. 2 3 capillaries of capillaries of the the lungs heart rest of the body 1 4 Which vessels carry oxygenated blood? A 1 and 2 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2018

17 Which pathway is taken by blood in a fish? A gills → heart → body → gills B body → gills → heart → body C heart → gills → body → heart D heart → body → gills → body

1 marks

Answer: C

This question in 0970/21 May/June 2020

17 The diagrams show the single circulation of a fish and the double circulation of a mammal. gill capillaries lung capillaries X R Y S ventricle atria atrium ventricles T Z body capillaries body capillaries fish circulation mammal circulation Which letters represent areas of oxygenated blood? A R and X B S and Y C T and Y D T and Z

1 marks

Answer: B

This question in 0970/22 May/June 2020

17 What ensures that blood flows in one direction in the human circulatory system? A diffusion of carbon dioxide B diffusion of oxygen C thick walled arteries D valves

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2020

20 The diagram shows some of the structures in a human lung. Where is the carbon dioxide concentration highest? from pulmonary artery C B to pulmonary vein D A

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2020

31 How will the composition of a pregnant woman’s blood change as it passes through the placenta? concentration of concentration of dissolved oxygen urea A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: B

This question in 0970/21 May/June 2021

19 How does blood enter the heart? A through arteries into the atria B through arteries into the ventricles C through veins into the atria D through veins into the ventricles

1 marks

Answer: C

This question in 0970/22 May/June 2021

20 What is the sequence of organs that blood passes through during one circulation of the body of a fish? A muscle  heart  gill  muscle B muscle  gill  heart  muscle C muscle  heart  gill  heart  muscle D muscle  gill  heart  gill  muscle

1 marks

Answer: A

This question in 0970/22 May/June 2021

17 The diagram shows the circulatory system of a fish. X gills heart Y body Z Where in the circulatory system is the oxygen concentration lowest? A X only B X and Y C Y only D Y and Z

1 marks

Answer: A

This question in 0970/21 May/June 2022

18 What is a function of the lymphatic system? A absorption of glucose B blood clotting C circulation of body fluids D temperature regulation

1 marks

Answer: C

This question in 0970/21 May/June 2022

17 People are sometimes born with a ‘hole in the heart’. This is caused by a gap in the septum, as shown. key direction of blood flow If the gap in the septum is not repaired, it causes the person to become breathless more quickly. What is a possible explanation for this? A Deoxygenated blood in the left atrium mixes with oxygenated blood from the right atrium. B Deoxygenated blood in the right atrium mixes with oxygenated blood from the left atrium. C Oxygenated blood in the left ventricle mixes with deoxygenated blood from the right ventricle. D Oxygenated blood in the right ventricle mixes with deoxygenated blood from the left ventricle.

1 marks

Answer: C

This question in 0970/22 May/June 2022

17 Which statements describe how the structures in the circulatory system function? 1 a muscular pump to push blood into vessels 2 valves to ensure one-way blood flow 3 veins to take blood away from the heart 4 vessels to return blood to the heart A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 0970/21 May/June 2023

19 The diagram shows the blood vessels associated with the liver. X aorta Y liver key direction of blood flow Z NOT TO small intestine SCALE What are the blood vessels labelled X, Y and Z? X Y Z A hepatic artery hepatic portal vein hepatic vein B hepatic portal vein hepatic artery hepatic vein C hepatic vein hepatic artery hepatic portal vein D hepatic vein hepatic portal vein hepatic artery

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2023

19 What is an advantage of having a double circulatory system? A It uses less energy because blood flows through the heart only once in each circuit around the body. B Concentration gradients of solutes and gases are kept low. C Deoxygenated and oxygenated blood are separated to allow a high rate of oxygen supply to the tissues. D It maintains high-pressure blood flow to the lungs and low-pressure blood flow to the body.

1 marks

Answer: C

This question in 0970/21 May/June 2024

18 The diagram shows the circulatory system of a fish. X key oxygenated blood deoxygenated blood direction of blood flow What is the structure labelled X? A aorta B gills C heart D vena cava

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2024

15 In a fish, what is the sequence of structures that blood passes through after it leaves the heart? A gills  muscles  heart B gills  heart  muscles  heart C muscles  gills  heart D muscles  heart

1 marks

Answer: A

This question in 0970/21 May/June 2025

16 What is an advantage of a double circulatory system? A It allows the mixing of oxygenated and deoxygenated blood. B It can keep blood pressure high in the lungs. C Less carbon dioxide is removed from the body cells. D Oxygen is supplied to body cells by blood at high pressure.

1 marks

Answer: D

This question in 0970/22 May/June 2025