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CAIE IGCSE Biology 9 Transport in Animals Questions

Practise tracing circulation, interpreting heart and vessel diagrams and linking blood components to transport and defence.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

9.1 Circulatory systems9.2 Heart9.3 Blood vessels9.4 Blood

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: 8]

Fig. 2.1 shows a cross-section of a human heart.

Fig. 2.1

Fig. 2.1

Question (a)

(a)

On Fig. 2.1, label with an R the position of the right ventricle.

[ 1 ]

Question (b)

(b)

State the names of the structures labelled A and B on Fig. 2.1.

A
B

[ 2 ]

Question (c)

(c)

Complete the sentence about blood vessel C.

Blood vessel C transports blood from the to the

。

[ 2 ]

Question (d)

(d)

Fig. 2.2 shows a cross-section of part of a heart that has an incomplete structure.

Fig. 2.2

Fig. 2.2

Explain how the incomplete heart structure shown in Fig. 2.2 may affect a person's ability to transport oxygen.

[ 3 ]

Question 3

[Maximum number: 1]

What is a feature of veins?

A

one-cell-thick wall

B

narrow lumen

C

thick muscular walls

D

valves are present

Question 4

[Maximum number: 1]

Tissue plasminogen activators (TPAs) are human proteins that are used as drugs to break down blood clots.

TPAs break down blood clots by activating plasminogen. Plasminogen is a protein that is always present in the blood.

When activated, plasminogen forms a protease that breaks down fibrin molecules.

Plasminogen is found in the plasma.

State what is meant by the term plasma.

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