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BIO 308: Physiology
Lab 28
11
Physiology
Undergraduate 3
02/17/2016

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Term
electrocardiogram (ECG) is composed of a P-wave, a QRS complex, and a T-wave. these 3 components are measured:
Definition
once during each cardiac cycles
Term
the electrocardiogram (ECG) measures:
Definition
action potential in the atria and the ventricles
Term
in the ventricles of the human heart, the depolarizing phase of the action potential is associated w/:
Definition
the QRS complex
Term
in most people, the heart is located:
Definition
left of the midline
Term
heart lies in the thorax w/ its long axis:
Definition
pointing downward, at some angle b/w horizontal and vertical
Term
in the Lead I orientation, signals are recorded from the recording electrodes from:
Definition
both wrist
Term
in the Lead II orientation, signals are recorded from the recording electrodes from:
Definition
wrist & ankle
Term
the amplitude of the QRS wave in lead I is smaller than the amplitude of the QRS wave in lead II. this is b/c:
Definition
other options are both correct
(distance b/w 2 wrist in lead I is shorter
distance b/w the L.wrist & L.ankle is larger)
Term
if the heart were in the midline of th chest, then the distance b/w the heart and each recording electrode in lead I orientation would be:
Definition
the same
Term
if the tip of the heart pointed at the midline of the chest, then the 2 intersecting lines would cross at:
Definition
about 90 degrees
Term
in the lab simulation, it is assumed that the amplitude of the ECG is an indication of:
Definition
how far the heart lies off midline
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