Explain all the electrical and mechanical events which occur during each measured wave, segment and interval. An electrical event would be membrane polarization: depolarization, repolarization, resting membrane potential, hyperpolarization etc; mechanical events include blood flow, open or closed valves, heart sounds, contraction, relaxation, pressure changes, etc. An example of a complete answer for the P wave is given below. Feel free to use your lecture and/or textbook as a reference to make the connections between ECG and the cardiac cycle. This is a great way to review for the exam and apply what you are learning. P Wave – During the P wave, depolarization is sweeping from the SA node throughout both atria (electrical event). This leads to the beginning of atrial contraction (mechanical event). PR Interval - P-R Segment – QRS Complex – Q-T Interval – S-T Segment – T Wave – T-P Segment – R-R Interval –

Anatomy & Physiology
1st Edition
ISBN:9781938168130
Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
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3. Explain all the electrical and mechanical events which occur during each measured wave, segment and
interval. An electrical event would be membrane polarization: depolarization, repolarization, resting
membrane potential, hyperpolarization etc; mechanical events include blood flow, open or closed valves,
heart sounds, contraction, relaxation, pressure changes, etc. An example of a complete answer for the P wave
is given below. Feel free to use your lecture and/or textbook as a reference to make the connections between
ECG and the cardiac cycle. This is a great way to review for the exam and apply what you are learning.

P Wave – During the P wave, depolarization is sweeping from the SA node throughout both atria (electrical
event). This leads to the beginning of atrial contraction (mechanical event).
PR Interval -
P-R Segment –
QRS Complex –
Q-T Interval –
S-T Segment –
T Wave –
T-P Segment –
R-R Interval –
 
 
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