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8.3. The heart
A subsection of Biology, 9700, through 8. Transport in mammals
Listing 10 of 173 questions
Use shows the changes in blood pressure in the left atrium, left ventricle and aorta during one complete contraction of the heart. It also shows a recording of the electrical activity of the heart. -3 0.1 0.2 0.3 0.4 0.5 0.6 time / s left atrium left ventricle aorta Key: 0.7 0.8 -2 blood pressure /kPa electrical activity /mV Name the source of the electrical activity in the heart. Examiner’s Use Explain how the heart is coordinated so that the ventricle contracts after the atrium has contracted. With reference to , calculate the heart rate in beats per minute. Show your working and express your answer to the nearest whole number. Answer = beats min–1 The pressure in the right ventricle is rarely higher than 4.0 kPa. Explain why the pressure in the right ventricle is much lower than that in the left ventricle.
9700_w07_qp_2
THEORY
2007
Paper 2, Variant 0
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The diagram shows pressure changes in the left side of the heart and aorta over time. The length of this cardiac cycle is 0.6 s. Points 1, 2, 3 and 4 indicate when atrio-ventricular valves and semi- lunar valves either open or close. 0.6 0.5 0.4 0.3 0.2 0.1 time / s pressure / kPa key left ventricle aorta left atrium What is the total time during one cardiac cycle that the atrio-ventricular valves and the semi-lunar valves are both closed at the same time?
9700_w11_qp_11
MCQ
2011
Paper 1, Variant 1
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The diagram shows pressure changes in the left side of the heart and aorta over time. The length of this cardiac cycle is 0.6 s. Points 1, 2, 3 and 4 indicate when atrio-ventricular valves and semi- lunar valves either open or close. 0.6 0.5 0.4 0.3 0.2 0.1 time / s pressure / kPa key left ventricle aorta left atrium What is the total time during one cardiac cycle that the atrio-ventricular valves and the semi-lunar valves are both closed at the same time?
9700_w11_qp_13
MCQ
2011
Paper 1, Variant 3
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Describe the function of each of the following structures in the human heart: sinoatrial node (SAN) atrioventricular node (AVN) left atrioventricular valve. shows the changes in blood pressure in the left atrium, left ventricle and aorta during one complete cardiac cycle. – 2 0.80 time / s blood pressure / kPa A B C key aorta left ventricle left atrium D E F G H Complete the table below using the appropriate letter, A to H, to match the points from the graph to the correct statement. You must only put one letter in each box. You may use each letter once, more than once or not at all. statement letter left atrioventricular valve starting to open left atrioventricular valve starting to close left ventricle starting to contract minimum blood remaining in left ventricle
9700_w11_qp_23
THEORY
2011
Paper 2, Variant 3
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Questions Discovered
173