ConceptConceptDocsDocuments

Pearson Edexcel IAL Biology 7.12 Cardiac muscle electrical activity & ECGs

Practise reading ECG traces and linking myogenic cardiac muscle with SAN, AVN and conduction pathways that coordinate heartbeats.

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

7.12—Cardiac muscle electrical activity and ECGs 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 ]
All question bank results loaded