CAIE IGCSE Biology 9 Transport in Animals
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. Transport in animals question 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
9. Transport in animals question 2
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
[ 6 ]
Question (i)
(i)
State the name of structure V on Fig. 6.1 and describe its function.
[ 2 ]
Question (ii)
(ii)
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 (iii)
(iii)
Explain the advantages of the double circulation of the mammal.
[ 3 ]
Question (b)
(b)
The blood vessels that supply the heart muscle can become blocked.
[ 1 ]
Question (i)
(i)
State the name of the blood vessels that supply the heart muscle.
[ 1 ]
9. Transport in animals question 3
What is a feature of veins?
A
one-cell-thick wall
B
narrow lumen
C
thick muscular walls
D
valves are present
9. Transport in animals question 4
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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