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5129 s14 qp 12.pdf


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4
6

The diagram shows a section through the heart.

1

2
4

3

X

Y

What is the position of valves 1-4 while chambers X and Y are emptying?

7

valves 1 and 2

valves 3 and 4

A

closed

closed

B

closed

open

C

open

closed

D

open

open

How does the composition of expired air differ from inspired air?
carbon dioxide

nitrogen

oxygen

water vapour

A

decreases

increases

decreases

decreases

B

increases

decreases

increases

does not
change

C

increases

does not
change

decreases

decreases

D

increases

does not
change

decreases

increases

© UCLES 2014

5129/12/M/J/14