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    arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat.

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    Transcribed Image Text:29 of 30 <> I Review Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat. Rank from first to last. Do not overlap any tiles. • View Available Hint(s) AV node Purkinje fibers SA node AV bundle Internodal pathways Bundle branches First Element Depolarized Last Element Course Chat MacBook Pro

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    Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat.

    Click card to see definition 👆

    1) SA node

    2) Internodal pathways

    3) AV node 4) AV bundle 5) Bundle branches 6) Purkinje fibers

    Click again to see term 👆

    1. ________: Delay(s) occurs here while atria contract

    2. ________: Set(s) the pace for the entire heart

    3. ________: Link(s) between the SA node and AV node

    4. ________ : Electrical link(s) between atria and ventricles

    5. ________: Convey(s) the impulse throughout the ventricular walls

    6. ________: Convey(s) the impulse down the interventricular septum

    Click card to see definition 👆

    1. AV node: Delay(s) occurs here while atria contract

    2. SA node: Set(s) the pace for the entire heart

    3. Internodal pathways: Link(s) between the SA node and AV node

    4. AV bundle : Electrical link(s) between atria and ventricles

    5. Purkinje fibers: Convey(s) the impulse throughout the ventricular walls

    6. Bundle branches: Convey(s) the impulse down the interventricular septum

    Click again to see term 👆

    1/23 Created by dgb1621

    Terms in this set (23)

    Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat.

    1) SA node

    2) Internodal pathways

    3) AV node 4) AV bundle 5) Bundle branches 6) Purkinje fibers

    1. ________: Delay(s) occurs here while atria contract

    2. ________: Set(s) the pace for the entire heart

    3. ________: Link(s) between the SA node and AV node

    4. ________ : Electrical link(s) between atria and ventricles

    5. ________: Convey(s) the impulse throughout the ventricular walls

    6. ________: Convey(s) the impulse down the interventricular septum

    1. AV node: Delay(s) occurs here while atria contract

    2. SA node: Set(s) the pace for the entire heart

    3. Internodal pathways: Link(s) between the SA node and AV node

    4. AV bundle : Electrical link(s) between atria and ventricles

    5. Purkinje fibers: Convey(s) the impulse throughout the ventricular walls

    6. Bundle branches: Convey(s) the impulse down the interventricular septum

    Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat?

    A) SA node B) AV bundle C) AV node

    D) Internodal pathway

    A) SA node

    Which of these structures conduct(s) action potentials the slowest?

    A) Bundle branches B) AV bundle C) AV node D) Purkinje fibers C) AV node

    The anatomy of the intrinsic conduction system causes contraction of the ventricles to begin at the apex and move superiorly. Why is this important?

    A) so the atria can finish contracting before the ventricles contract

    B) so blood is forced upward, toward the semilunar valves

    C) because the Purkinje fibers conduct action potentials away from the heart apex

    D) because the AV bundle is the only electrical connection between the atria and the ventricles

    B) so blood is forced upward, toward the semilunar valves

    A person notices his or her heart beat because he or she senses blood being pumped by the heart. Excessive caffeine intake can lead to irregular heart rhythms (arrhythmias) that patients perceive as "skipped beats." Given that caffeine is a stimulant, which of the following mechanisms best explains the reason for the feeling that the heart skipped a beat?

    A) Action potentials are not delayed sufficiently at the AV node.

    B) Action potentials propagate into the ventricles before the contractile cells have repolarized from the previous heartbeat.

    C) Purkinje fibers initiate spontaneous action potentials, which cause the ventricles to contract early.

    D) Spontaneous action potentials in the SA node overlap such that the repolarizing phase of one action potential cancels out the depolarizing phase of the next.

    C) Purkinje fibers initiate spontaneous action potentials, which cause the ventricles to contract early.

    The beginning of the QRS complex of the electrocardiogram (ECG) immediately precedes which of the following events?

    A) closing of the atrioventricular valves

    B) atrial contraction

    C) closing of the semilunar valves

    D) blood ejection from the ventricles

    A) closing of the atrioventricular valves

    Which of the following can be heard with a stethoscope most easily?

    A) Closing of atrioventricular valves

    B) Contraction of atria

    C) Blood flow into aorta

    D) Isovolumetric contraction

    A) Closing of atrioventricular valves

    Calculate the cardiac output if heart rate (HR) is 90 beats per minute, stroke volume (SV) is 110

    ml/beat, end diastolic volume (EDV) is 140

    ml, and end systolic volume (ESV) is 30

    ml HINT: (HR * SV= CO) A) 9.9 L/min B) 14.0 L/min C) 20.0 L/min D) 34.0 L/min A) 9.9 L/min

    An increase in sympathetic stimulation of the heart would increase stroke volume by increasing __________.

    A) end diastolic volume

    B) heart rate

    C) end systolic volume

    D) contractility D) contractility

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