Class 11 Zoology simulations · Body Fluids and Circulation

Electrocardiogram (ECG)

Read an ECG trace: P wave, QRS complex and T wave. Count QRS complexes to find the heart rate.

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What to notice

P: atrial depolarisation; QRS: ventricular depolarisation (start of contraction); T: ventricular repolarisation.

Key relation

Heart rate = 60 / (R–R interval in s)

Try this

Raise the heart rate and measure the shorter R–R interval.

What you can change

• Heart rate: 40 to 180 beats/min
• Highlight wave: choose P wave, QRS complex, T wave

More in Body Fluids and Circulation

• Blood groups and transfusion
• The cardiac cycle
• Double circulation

See all Class 11 Zoology simulations or every Physica simulation.