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Q1. The diagram shows the pathways in the heart for the conduction of electrical impulses
during the cardiac cycle.




(a) The table shows the blood pressure in the left atrium, the left ventricle and the aorta
at different times during part of a cardiac cycle.

Blood pressure / kPa
Time…

Page 2

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the right ventricle. What causes this difference in pressure?

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(1)




(c) The information below compares some features of different blood vessels.

Blood vessel
Artery Capillary Vain
Mean diameter
4.0 mm 8.0 m 5.0 mm
of vessel
Property
Mean thickness
1.0 mm 0.5 m 0.5 mm
of wall
Relative…

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(6)
(Total 9 marks)




Q2. The photographs show sections through alveoli of healthy lung tissue and lung tissue
from a person with emphysema. Both photographs are at the same magnification.




Biophoto Associates, Science Photolibrary

(a) Give two differences that can be seen between the healthy lung tissue and the…

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(3)
(Total 5 marks)




Q3. (a) Pulmonary tuberculosis is a disease of the lungs. Describe the transmission and
course of infection of pulmonary tuberculosis.

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(b) Emphysema is another disease of the lungs. People with emphysema may…

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(5)
(Total 10 marks)




Q4. The diagram shows a human heart as seen from the front. The main blood vessels
are labelled D to G. The arrows show the pathways taken by the electrical activity involved
in coordinating the heartbeat in the cardiac cycle.…

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(1)




(ii) carries deoxygenated blood to the lungs?




(1)




(b) Explain, in terms of pressure, why the semilunar valves open.

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(c) When a wave of electrical activity reaches the AVN, there is a short delay before a
new wave leaves the AVN. Explain the importance of…

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(i) Calculate the athlete's stroke volume after training. Show your working.




.............................. cm 3


(2)




(ii) Use information from the table to explain how training has caused the resting
heart rate of this athlete to be lower.

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(2)
(Total 9 marks)




Q5. A doctor measured…

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7 1.6 3.9




(a) he two people were breathing out during the time shown. What evidence in the
T
table supports this statement?

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(1)




(b) Calculate the rate at which person A
breathed air out of his lungs between 0 and 3
seconds. Show your working.




Answer .............................................…

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(4)
(Total 8 marks)




Q6. (a) (i) The human heart has four chambers.
In which one of the four chambers of the human heart does pressure reach
the highest value?

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(1)




(ii) Explain how the structure of this chamber causes this…

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0.3 70
0.4 56
0.5 55
0.6 98
0.7 125


(b) (i) Use the data in the table to calculate the man's heart rate.



Heart rate = ............................................. beats per minute

(ii) Use the data in the table and your answer to part (b) (i) to calculate the man's
cardiac…

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