18.
The figure below shows an electrocardiogram representation of one heartbeat.
Components of the electrocardiogram are marked with the letters A, B, C, D, E,
F, G, and H. Opposite each letter write the letter name of the component as
shown in the first blank line.
* A = P wave
* E = ______
* B = ______
* F = ______
* C = ______
* G = ______
* D = ______
* H = ______
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MD0571
3-23