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BIO 253 Quiz 2 | Atcual Exam Questions and Answers with Verified Solutions | Latest Updated 2026

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BIO 253 Quiz 2 | Atcual Exam Questions and Answers with Verified Solutions | Latest Updated 2026

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BIO 253 Quiz 2 | Atcual Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026



What is the pacemaker of the SA node
heart?


What is the function of the AV delays the electrical impulse in order to
node? allow the
atria to contract and complete filling the
ventricles


What is the normal length of the 0.12-0.20 seconds
PR
interval?


What is the normal length of the <0.12 seconds
QRS
complex?


What is the normal length of the 0.34-0.43 seconds
QT
interval?

, What is the order of the SA node > atrial syncytium > junctional
conduction fibers > AV
system? node > AV bundle (bundle of his) > Right
and Left
bundle branches > Purkinje fibers >
ventricular
syncytium


P wave atrial depolarization, prior to atrial
contraction


QRS complex ventricular depolarization, prior to
ventricular
contraction


T wave ventricular repolarization, prior to
ventricular
relaxation


PR interval time between onset of atrial depolarization
and
onset of ventricular depolarization


ST segment ventricular contraction

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