A&P II Section 1.3 Heart Conduction System

The __________ conducts impulses from the AV node to branches that lead to the Purkinje fibers.

AV bundle

The delay 0.15 seconds from the SA node action potentials and the AV action potentials is due to travel from one node to the other the slow propagation of the AV node the need for the atria to contract completely prior to the ventricles initiating contraction a and b all of the above

All of the above

he P wave of an ECG represents atrial repolarization. atrial depolarization. ventricular repolarization. ventricular depolarization.

Atrial Depolarization

The electrocardiogram (ECG or EKG) is a helpful tool to diagnose cardiac abnormalities in a noninvasive way. However, it cannot measure which of the following cardiac events? heart rate heart rhythm heart conduction pathways heart force of contraction

heart force of contraction

Which of the following is the BEST answer for when blood would be ejected from the right and left ventricle? Immediately following the P-wave Between a Q-wave and and R-wave Immediately following an S-wave Between a T-wave and the next P-wave

Immediately following an S-wave

Which wave signals the onset of atrial contraction? P wave QRS complex T wave none of the above

P Wave

An ECG analysis can NOT reveal which of the following abnormalities? hypertension at the aorta abnormal conduction pathways an atrophy of the heart approximate location of damage none of the above. The analysis can reveal any of the listed abnormalities.

hypertension of the aorta

Given these structures of the conducting system of the heart:(1) atrioventricular bundle;(2) AV node;(3) bundle branches;(4) Purkinje fibers;(5) SA node.Choose the arrangements that lists the structures in the order an action potential passes through them.

5,2,1,3,4

The conducting system is in place to stimulate the contraction of the ventricles only.

False

Which wave signals the onset of ventricular contraction? P wave QRS complex T wave none of the above

QRS Complex

The conducting system of the heart:

causes ventricular contraction at the apex, which then progresses towards the base of the heart.

A physician wants to detect the summation of all the action potentials transmitted by the cardiac muscle cells through the heart in an noninvasive way. What test would you suggest to the physician that he/she use? echocardiogram electroencephalogram electrocardiogram electromyogram

electocardiogram

The electrocardiogram (ECG or EKG) is a helpful tool to diagnose cardiac abnormalities in a noninvasive way. However, it cannot measure which of the following cardiac events? heart rate heart rhythm heart conduction pathways heart force of contraction

heart force contraction

Failure of the SA node to depolarize would result in an ECG lacking a T wave. lacking a QRS complex. lacking a P wave. that is isoelectric.

lacking a P wave

An ECG is a direct measurement of mechanical events in the heart monitors and records the propagation of cardiac action potentials gives an indication of the force of contraction a and b only all of the above

monitors and records the propagation of cardiac action potentials

Which wave represents atrial repolarization? P wave QRS complex T wave none of the above

none of the above

The ventricular walls begin contraction in response to

the Purkinje fibers generating action potentials

The ventricular walls begin contraction in response to AV node stimulation action potentials reaching the AV bundle the Purkinje fibers generating action potentials the SA node "firing" all of the above

the Purkinje fibers generating action potentials

The delay 0.15 seconds from the SA node action potentials and the AV action potentials is due to

travel from one node to the other the slow propagation of the AV node the need for the atria to contract completely prior to the ventricles initiating contraction

From the beginning of the Q wave to the completion of the T wave corresponds to the time required for the _______________ to ____________________. atria; contract atria; contract and begin to relax ventricles; contract ventricles; contract and begin to relax

ventricles; contract and begin to relax

The "pacemaker" of the heart is considered the

SA Node

The conducting system of the heart:

SA node, AV node, bundle of His, bundle branches, and Purkinje fibers

Which wave corresponds to ventricular repolarization? P wave QRS complex T wave none of the above

T Wave

The QRS complex represents ventricular repolarization ventricular depolarization atrial depolarization atrial repolarization

Ventricular Depolarization