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Atrial depolarization occurs at the P wave. The atrial contraction occurs at the peak of the wave at the influx of calcium ions to prolong depolarization.
Wiki User
∙ 10y ago
Wiki User
∙ 12y agoSimple answer is p wave
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Is the p wave part of the cardiac cycle?
Yes - On an ECG the P wave is the first wave of the cardiac cycle. It represents the Sinoatrial node which is the natural pacemaker of the heart firing and causing the atria to contract in order to fill the ventricles.
In a normal ECG tracing?
the repolarization of the atria is hidden by the QRS wave
What happens in the cardiac cycle immediately before P wave?
The P wave on an ECG occurs when the sinoatrial node which is the hearts natural pacemaker fires causing the atria to contract. The period just before this when there is no electrical activity is the hearts 'resting' period between beats when the muscles are relaxed giving the atria a chance to refill with blood.
What is polarization in the electrocardiogram?
The contraction of any peart of heart in ecg is known as polarization. Eg contraction of atria is known as polarization of atria
What contraction of the atria results from which wave of depolarization on the ECG tracing?
P wave
When atria relax ventricles do what?
When relaxed, the atria expand, and then the ventricles contract.
Do atria contract before the ventricles?
Yes, atria contracts before the ventricles.
What happens when the atria contract?
it is cool
What are the 3 components of the ECG trace?
The EKG or ECG components are the P wave (contraction of the atria), the QRS complex (the contraction of the ventricles) and the T wave (repolarization of the ventricles).
An electrical signal causes the atria to?
bubble up and popno one knowsthe signal causes the atria to contract.
What valves open when the atria contract?
tricuspid valve
What system has the atria?
The atria are a part of your heart which is in the circulatory system
