NOTE depolarization leads to muscle contractions Repolarization leads to muscle relaxations. Represents the time interval from the beginning of ventricular depolarization to the end of repolarization of the ventricles. Represents the electrical recovery of the ventricles. Represents the contraction of the ventricles. Q-T interval vv Represents the time from the end of ventricular depolarization to the beginning of repolarization of the ventricles. Represents the contraction of the atria. Represents the time from the end of atrial depolarization to the beginning of ventricular depolarization. P-R segment ∼ Represents the time from the beginning of atrial depolarization to the beginning of ventricular depolarization. Represents the period of time when the hear
Added by Roy G.
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Step 1: The time interval from the beginning of ventricular depolarization to the end of repolarization of the ventricles is represented by the Q-T interval. Show more…
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The contraction of the heart begins with autorhythmic depolarization of the pacemaker node located in the superior portion of the posterior atrial wall. From the right atrium, the signal travels into the atrioventricular (AV) node located in the inferior interatrial septum. The AV node fires, causing the signal to pass through the AV bundle branches. Depolarization then arrives at the subendocardial conducting network, where the wave of depolarization disperses through the myocardium of the atria. Making a U-turn at the apex of the heart, the signals are then carried through the exterior walls of the ventricles by the ventricles. Finally, the signals reach the semilunar valves and the wave of depolarization continues into the ventricles.
Madhur L.
During the phase of the cardiac cycle called , the entire heart is relaxed and blood flows into all four chambers. 2. during the phase of the cardiac cycle called , the heart contracts beginning with the atria and then the ventricles. 3. when the ventricles contract, the snap closed. 4. a defective heart valve can be identified by the sound of a(n) . 5. the , or pacemaker, initiates the heartbeat by generating electrical impulses that spread across both atria. 6. impulses are delayed briefly at the and are then transmitted through special fibers to the base of the ventricles. strong contractions begin at the apex of the heart and drive blood up and out of the heart. 7. a(n) records the electrical changes that occur during the heartbeat and provides data on the health of the heart.
Evelyn D.
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