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On the ECG, the time necessary for the spread of an electrical impulse through the AV node, bundle of His, right and left bundle branches, and the Purkinje fibers is reflected by the

Where is the negative electrode placed in lead II?

The QT interval is measured:

The absolute refractory period

When the cardiac muscle cell is stimulated, the cell is said to

The coronary arteries originate at the base of the

The intrinsic rate of the SA node is

The period of time during the cardiac cycle when cells cannot respond to a stimulus, no matter how strong, is called the relative refractory period.

When electrical activity is not detected on the ECG, a straight line is recorded called the “baseline” or “isoelectric line.”

“Chronotropy” refers to an effect on