The various waveforms seen on the electrocardiogram ECG or E

The various waveforms seen on the electrocardiogram (ECG or EKG) recording represent:

Select one:

a. the action potentials of the ventricular muscle cells

b. the resting potential of all cardiac muscle cells

c. the sum of all action potentials in the heart  

d. one single cardiac action potential

e. the hydrostatic pressure in the heart during the cardiac cycle

f. the tension developed by the heart muscle contraction

The EKG can be measured 12 different ways. Each way is called a \'lead\'. Which lead represents the electrical activity as measured from the single perspective of the left arm or shoulder?

Select one:

a. V1

b. lead II

c. aVR

d. V3

e. lead I

f. V2

g. V6

h. aVL

Solution

1)a) the action potentials of the ventricular muscle cells

as the polarization and depoloarization of the muscles in the waveforms are the action potentials.

2)h) aVL as it is the positive elctrode on the left shoulder or the arm.