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which limb lear is ground

RL
one small square=

1mm = .04 sec
ine large square =

5mm = .20sec
5 large squares =

1 sec
define polarized

the heart at rest. no impulse,stimulation,contraction,and no measurable activity
define depolarization

also means dischrage of electrical energy, or activity of the heart during impulse thast causes contraction the contracytion itself. this impulse can be measured by ECG