The P wave and the QRS complex represent depolarization of the atrial and ventri
ID: 97099 • Letter: T
Question
The P wave and the QRS complex represent depolarization of the atrial and ventricular muscle respectively. What causes the QRS complex to have the largest amplitude? What is the specific aspect of ventricular depolarization that produces the S wave? What does the PR interval represent? What happens to the PR interval with a first-degree block? What does the QT interval represent? The range for a normal resting heart rate is 60 to 90 BPM. A trained athlete could have a resting heart rate of 45 to 60 BPM. What could cause a very fit person to have a slower heart rate than someone of average fitness?Explanation / Answer
3.Presence of s wave is due to the larger left ventricle and more Pukinjie fibers.
4.Interval between beginninig of atrial depolarization to the beginning of ventricular depolarization.
5.first-degree heart block, is defined as prolongation of the PR interval on an electrocardiogram (ECG) to more than 200 msec.Normally, this interval should be between 120 and 200 msec in the adult population. First-degree AV block is considered “marked” when the PR interval exceeds 300 msec.
6., the QT interval is a measure of the time between the start of the Q wave and the end of the T wave in the heart's electrical cycle. The QT interval represents electrical depolarization and repolarization of the ventricles.
7.Cardiovascular efficiency depends on a number of factors. One measure is called stroke volume, which is the volume of blood pumped per heartbeat. A fit individual has a larger stroke volume, which means a greater volume of oxygen is delivered to the body per heartbeat. This is also the reason fit people have a lower resting heart rate. As mentioned, muscles reqire a given amount of fuel, even at rest, which doesn't change with exercise training. Because exercise training has increased the volume of oxygen that can be delivered to muscles per heartbeat, the heart needs to beat less to do the same job. Therefore, the heart rate is lowered.
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