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Edexcel A-Level Biology A2 7.12 Cardiac Muscle Electrical Activity and Ecgs Questions

Read ECG traces to calculate heart rate, compare PQRST features and explain how myogenic cardiac muscle, the SAN and AVN coordinate each heartbeat.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • calculate heart rate from ECG traces by counting named peaks over a time interval
  • compare P, QRS and T wave features between normal and abnormal ECG traces
  • explain myogenic heartbeat initiation and impulse coordination through SAN and AVN

Edexcel A-Level Biology A2 7.12 Cardiac Muscle Electrical Activity and Ecgs Questions question 1

[Maximum number: 5]

Alpha-1 antitrypsin (AAT) deficiency is an inherited disease that can affect different organ systems.

Alpha-1 antitrypsin (AAT) is a protein produced in the liver.

Question (a)

(a)

Activity of the heart was investigated in the same patient.

The trace shows a normal electrocardiogram (ECG).

Figure for Question (a) — Edexcel A-Level Biology A2
[ 5 ]

Question (i)

(i)

Name the stage of the cardiac cycle at T on this ECG.

[ 1 ]

Question (ii)

(ii)

The ECG of the patient with AAT is shown in the trace.

Figure for Question (ii) — Edexcel A-Level Biology A2

Calculate the mean heart rate shown in this ECG trace.

Answer

[ 1 ]

Question (iii)

(iii)

Compare and contrast the ECG trace of this patient with the normal ECG trace.

[ 3 ]
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