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AS AQA BIOLOGY MTA - THE HEART AND CHD COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS 100% GRADE A+
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AS AQA BIOLOGY MTA - THE HEART AND CHD COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS 100% GRADE A+
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AS AQA BIOLOGY MTA - THE HEART AND CHDStudy online at https://quizlet.com/_dldbfx
1. Between which times is the valve between atrium 0.1 and 0.5 so the pres-
and the ventricle closed? Explain sure is greater in the
ventricle than in the
atirum.
2. The max pressure in ventricle is much higher The ventricle has thick
than that in the atrium. Explain what causes this: walls so the contrac-
tions are stronger.
3. Use the info in the table to calculate the heart rate 85
in beats per minute
4. Explain why both the heart and arteries are de- They contain different
scribed as organs. tissues.
5. What is the approximate length of one cardiac 0.8 seconds
cycle?
6. At what time is there least blood in the right 0.4 seconds as the se-
ventricle so explain answer? quences in right ventri-
cle is same as the left
ventricle.
7. Between which times are the muscles in the wall between 0 and 0.1 be-
of the left atrium contracting? cause the volume of
blood is increasing.
8. Between which times are the semilunar valves in between 0.1 and 0.4 as
the arteries open? the volume of blood is
decreasing.
9. The maximum volume of blood in the left ventri- 45/100 x 35 = 15.75 cm3
cle is 45cm3. Calculate the volume of blood in the
left ventricle at 0.5 seconds.
10. Between which times is the left atrum contract- Between 0.1 seconds
ing? and 0.6 seconds as the
volume in the left ventri-
cle is increasing.
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, AS AQA BIOLOGY MTA - THE HEART AND CHD
Study online at https://quizlet.com/_dldbfx
11. Use the graph to calculate the heart rate and HR = 75 beats per
stroke volume minute and stroke vol-
ume = 70 cm3.
12. Describe how you would calculate cardiac output Multiply them.
from heart rate and stroke volume.
13. Suggest a value for the rate of blood flow t the 750
brain during exercise.
14. Calculate the ratio of the rate of blood flow into 4:1
the coronary arteries during exercise to the rate
flowing into these arteries at rest.
15. At rest the rate of flow of blood to the heart 18 cm3
muscle is 0.9cm3 g-1 per minute. Calculate the
volume of blood 1g of heart muscle would re-
ceive in 5 minutes of vigorous exercise
16. At what time is the volume of blood in the ventri- 0.1 second
cle at a maximum?
17. Calculate the HR in beats per minute 75 beats per minute
18. The valves between the atria and ventricles are Pressure is higher in the
closed between 0.1 seconds and 0.4 seconds. ventricle than the pres-
Explain how pressure causes these valves to sure in the atria.
shut
19. Explain how the closure of these valves is essen- It prevents the backflow
tial to the functioning of the heart of blood.
20. Describe how venous blood pressure affects Increase in stroke vol-
stroke volume: ume as blood pressure
increases and remains
constant after 3 kPa.
21. At venous pressure of 2 kPa, the cardiac output 5600/70 = 80
is 5600 cm3 per minute. Calculate the number of
times the ventricle contracts in one minute.
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