MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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QRS
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T
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P
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S-T
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Detailed explanation-1: -The P wave represents the electrical depolarization of the atria. In a healthy person, this originates at the sinoatrial node (SA node) and disperses into both left and right atria.
Detailed explanation-2: -The P wave is the first positive deflection on the ECG and represents atrial depolarisation. The P wave is the first positive deflection on the ECG. It represents atrial depolarisation. Normal duration: < 0.12 s (< 120ms or 3 small squares)
Detailed explanation-3: -The SA node fires at a normal rate of 60–100 beats per minute (bpm), and causes depolarization in atrial muscle tissue and subsequent atrial contraction.
Detailed explanation-4: -It is located at the junction of the crista terminalis in the upper wall of the right atrium and the opening of the superior vena cava. These cells have the ability to spontaneous generate an electrical impulse. It is the integrated activity of these so-called pacemaker cells that form the SA node.