Notes in 2 Conductivity, Rhythmicity, and Regulation

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Published	10/07/2024	Which match is correct?SA node: 20-40 bpmAV node: 20-40 bpmSA node: 40-60 bpmAV node: 40-60 bpm
Published	10/07/2024	Where is the AV node located?A. Superior posterolateral wall of the RA immediately below and slightly lateral to the SVCB. Pathway for action potentia…
Published	10/07/2024	T/FThe SA node is located in the superior posterolateral wall of the right atrium.The AV node initiates the electrical impulse in the heart.
Published	10/07/2024	What is wrong about the Bachmann’s Bundle?A. It is also known as the anterior interatrial bandB. Pathway for action potentials to travel from the SA n…
Published	10/07/2024	3 main tracts of the internodal pathwaysA. Anterior, middle posteriorB. Left, right, anteriorC. Inferior, superior, middleD. Left, right, posterior
Published	10/07/2024	Delay of impulse conduction from atria to ventricles is mainly caused by what?A. SA nodeB. AV nodeC. Purkinje fibersD. NOTA
Published	10/07/2024	T/FThe AV node delays the conduction of the electrical impulse.The delay allows the ventricles to fully contract before the atria.
Published	10/07/2024	If the AV node is blocked, what happens?A. The Purkinje fibers take over pacemaker functionB. The atria continue to beat normallyC. The heart stops be…
Published	10/07/2024	T/FThe atrioventricular fibrous tissue prevents direct conduction between atrial muscle fibers and ventricular muscle fibersIt ensures that impulses t…
Published	10/07/2024	Which is true regarding the delay of impulse conductionI. SA node to AV node: 0.03 secondsII. AV node to AV bundle: 0.09 secondsIII. AV bundle to bran…
Published	10/07/2024	What is the main function of the Purkinje fibers?A. Delay electrical impulsesB. Conduct impulses rapidly to the ventricular muscleC. Control the heart…
Published	10/07/2024	Which of the following are true regarding the AV node?I. It delays the electrical impulse.II. It has fewer gap junctions than Purkinje fibers.III. It …
Published	10/07/2024	T/FThe Purkinje fibers have very few myofibrils and do not contract much.The Purkinje fibers are responsible for rapid conduction of the electrical im…
Published	10/07/2024	If there is a block in the Purkinje fibers, what happens?A. The ventricles contract slowerB. The atria take over ventricular contractionC. The heart c…
Published	10/07/2024	What does the delay caused by the AV node achieve?I. Ensures atria contract before ventriclesII. Prevents backward conductionIII. Synchronizes atrial …
Published	10/07/2024	Abnormality in the ventricular Purkinje systemCan lead to disruption of normal, rapid spread of electrical signal to the ventriclesLeads to uncoordina…
Published	10/07/2024	T/FPurkinje fibers penetrate the endocardium on both the right and left sides of the ventricular septum, ensuring synchronized contraction of the vent…
Published	10/07/2024	All are true regarding Purkinje fibers exceptA. Electrical impulses in the Purkinje fibers are transmitted at speeds ranging from 8 to 10 m/sB. Approx…
Published	10/07/2024	T/FThe electrical conduction system ensures that the ventricles contract from the base upward.The Purkinje fibers cause the apex of the heart to contr…
Published	10/07/2024	What occurs if the conduction through the AV bundle is blocked?A. The ventricles beat independentlyB. The atria stop contractingC. Blood pressure rema…
Published	10/07/2024	True of AV bundle, except:A. Bifurcates or divides into the left and right branchesB. Acts as a pathway for action potentials to travel from the SA no…
Published	10/07/2024	What causes the delay in electrical conduction from the atria to the ventricles?A. Fewer gap junctions in the AV nodeB. The size of the atriaC. Slower…
Published	10/07/2024	What happens if there is an ectopic pacemaker in the AV node?A. The heart rhythm becomes irregularB. The SA node takes over pacemaker activityC. The a…
Published	10/07/2024	Which statement is false about the purkinje fibers?A. These fibers course sidewise around each ventricular chamber and back toward the base of the hea…
Published	10/07/2024	What is the primary function of the AV bundle (Bundle of His)?A. To delay the electrical signalB. To transmit the electrical impulse to the ventricles…
Published	10/07/2024	T/FTotal transmission time from the initial bundle branches to the endocardial surface of the ventricle is 0.03 secondsTotal transmission time from th…
Published	10/07/2024	Intrinsic rhythmical discharge of Purkinje fibersA. 70-80x per minuteB. 40-60x per minuteC. 13-40x per minuteD. 15-40x per minute
Published	10/07/2024	Common locations of ectopic pacemaker, EXCEPT:A. AV NodeB. Purkinje fibersC. SA nodeD. Atrial or ventricular muscle
Published	10/07/2024	In the event that the AV node is blocked, which of the following happens?A. Purkinje system takes over with an immediate responseB. Leads to cardiac m…
Published	10/07/2024	What does the P wave in an electrocardiogram (ECG) represent?A. Atrial depolarizationB. Ventricular depolarizationC. Atrial repolarizationD. Ventricul…
Published	10/07/2024	T/FThe QRS complex represents ventricular depolarization.The P wave represents ventricular repolarization.
Published	10/07/2024	What would you expect if the QRS complex is abnormally wide?A. There is a delay in ventricular conductionB. The atria are contracting faster than norm…
Published	10/07/2024	What does the T wave represent in the ECG?A. Atrial depolarizationB. Atrial repolarizationC. Ventricular repolarizationD. Ventricular depolarization
Published	10/07/2024	What is the normal duration of the P-R interval in an ECG?A. 0.08 secondsB. 0.12 secondsC. 0.16 secondsD. 0.20 seconds
Published	10/07/2024	The T wave follows the P wave in an ECG.The Q-T interval measures the time between the beginning of ventricular depolarization and the end of ventricu…
Published	10/07/2024	What happens if the P-R interval is prolonged?A. The heart rate increasesB. The ventricles contract too earlyC. The conduction from atria to…
Published	10/07/2024	Which part of the ECG corresponds to ventricular depolarization?A. P waveB. QRS complexC. T waveD. P-R interval
Published	10/07/2024	What does the Q-T interval represent?A. The time from the start of atrial depolarization to ventricular depolarizationB. The time from the start of ve…
Published	10/07/2024	T/FThe QRS complex is related to atrial depolarization.The T wave represents ventricular repolarization.
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