d drag the word(s) that accurately constructs each sentence that correlates the
ID: 3519284 • Letter: D
Question
d drag the word(s) that accurately constructs each sentence that correlates the electrical events with the mechanical events of the ca Shorter P-R intervals than normal indicate that the impulse originated somewhere other than the SA node longer Heart rate is measured on an ECG tracing by measuring the QRS complex repolarization myocardial damage P-R intervel Immediately after ventricular depolarization, represented by the QRS complex, the ventricles contract to eject blood into arteries The P-R interval measures the interval between atrial depolarization and ventricular To collect information about impulse conduction from the atria to the shorter SA node P wave ventricles, the P-R.interval should be studied. depolarization and the beginning of ventricular repolarization. A change in the S-T segment may indicate such The represents the end of ventricular as ischemia or injury The measures ventricular depolarization and R-R interval repolarization, and its length varies with heart rate. Q-T interval depolarization S-T segment The faster the heart rate, the shorter the Q-T interval; the slower the heart rate, the longer the Q-T interval.Explanation / Answer
Heart rate is measured: R-R interval
Immediately ventricular depolarization : QRS complex
The P R interval : ventricular depolarisation
To collect information about impulse conduction : P R interval
The S T segment represents end of ventricular depolarisation.....
The change in S T segment: myocardial damage
The Q T interval measures ventricular depolarisation and repolarisation
Cardiocytes resting membrane potential : -90 mV
Towards end of depolarisation: voltage gated potassium channels open
Additional sodium channels: enter the cell
The drift towards the threshold: fast calcium channels
Towards end of cardiocyte depolarisation : potassium channels
With increased permeability to extracellular calcium
Movement of potassium: out of the cell
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