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CAIE IGCSE Biology 9.1 Circulatory Systems Questions

Practise circulatory-system questions on pumps, valves and vessels, then compare fish single circulation with mammalian double circulation advantages.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify the heart as a pump, arteries and veins by blood-flow direction, and valves as one-way controls
  • trace fish single circulation and mammalian double circulation through heart, gills or lungs and body tissues
  • explain how separated oxygenated and deoxygenated blood and a second pump maintain high-pressure, efficient delivery to active tissues

Covered syllabus points

9.1.1—Circulatory system as a system9.1.2—Single circulation of a fish9.1.3—Double circulation of a mammal9.1.4—Advantages of a double circulation

Question 1

[Maximum number: 1]

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

Question 2

[Maximum number: 4]

Question (a)

(a)

Fig. 6.1 shows diagrams of the circulatory systems of a fish and a mammal.
The arrows show the direction of blood flow through the circulatory systems.

Fig. 6.1

Fig. 6.1

[ 4 ]

Question (i)

(i)

Fig. 6.1 shows that fish and mammals have different types of circulation.

State why the fish circulation is called a single circulation.

[ 1 ]

Question (ii)

(ii)

Explain the advantages of the double circulation of the mammal.

[ 3 ]

Question 3

[Maximum number: 2]

Fig. 1.1 is a simplified diagram of the circulatory system in humans.

Fig. 1.1

Fig. 1.1

State the evidence from Fig. 1.1 that the diagram shows a double circulation system.

Question 4

[Maximum number: 1]

Fig. 6.1 shows diagrams of the circulatory systems of a fish and a mammal.
The arrows show the direction of blood flow through the circulatory systems.

Fig. 6.1

Fig. 6.1

Fig. 6.1 shows that fish and mammals have different types of circulation.

State why the fish circulation is called a single circulation.

Question 5

[Maximum number: 3]

Fig. 6.1 shows diagrams of the circulatory systems of a fish and a mammal.
The arrows show the direction of blood flow through the circulatory systems.

Fig. 6.1

Fig. 6.1

Explain the advantages of the double circulation of the mammal.

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