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1 Fig. 1.1 is a diagram of the human heart. The diagram shows the phase during the heart beat
when the atria contract. The blood vessels that carry blood to and from the heart are labelled
A to F.
C D
B
1 left atrium
right atrium
A F
Fig. 1.1
(a) (i) Draw one arrow on Fig. 1.1 to show the pathway taken by blood from a vein into the
right ventricle. [1]
(ii) Identify the letter of the blood vessel that carries blood at the highest pressure and state
its name.
letter ...............
name of the blood vessel ..................................................................................................
[1]
(b) (i) Suggest what causes the valves at 1 and 2 to close during a heart beat.
...........................................................................................................................................
.......................................................................................................................................[1]
(ii) State the function of valves 1 and 2 in the heart.
.......................................................................................................................................[1]
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(c) Fig. 1.1 shows the phase of the heartbeat when the ventricles are filling with blood.
Using Fig. 1.1, describe and explain how the blood travels from the right ventricle to the
lungs.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...............................................................................................................................................[4]
(d) State the name of the part of the heart labelled 3 and state its role in the mammalian
circulation.
name .........................................................................................................................................
role ............................................................................................................................................
...................................................................................................................................................
[2]
[Total: 10]
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