CAIE IGCSE Biology 9.1 Circulatory Systems

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

Exam points

identify pumps, vessels and valves that keep blood moving one way through a circulatory system
trace fish single circulation and mammalian double circulation on route diagrams
explain double circulation using separated blood, body pressure and lung protection

Covered syllabus points

9.1.1—Circulatory system as a system 9.1.2—Single circulation of a fish 9.1.3—Double circulation of a mammal 9.1.4—Advantages of a double circulation

[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

1, 2 and 3

1, 2 and 4

1, 3 and 4

2, 3 and 4

[Maximum number: 4]

(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

[ 4 ]

(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 ]

(ii)

Explain the advantages of the double circulation of the mammal.

[ 3 ]

[Maximum number: 2]

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

Fig. 1.1

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

All question bank results loaded

Covered syllabus points

9.1 Circulatory systems question 1

9.1 Circulatory systems question 2

Question (a)

Question (i)

Question (ii)

9.1 Circulatory systems question 3