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The given figure is the ECG of a normal human. Which one of its components is correctly interpreted below?
Option: 1
Complex QRS- one complete pulse
Option: 2
Peak T- initiation of total cardiac contraction
Option: 3
Peak P and Peak R together - systolic and diastolic blood pressures
Option: 4
Peak P- initiation of left atrial contraction only
Answers (1)
P wave is formed when the atria (the two upper chambers of the heart) contract to pump blood into the ventricles.
QRS Complex is formed when the ventricles (the two lower chambers of the heart) are contracting to pump out blood.
ST segment measures the end of the contraction of the ventricles to the beginning of the rest period before the ventricles begin to contract for the next beat.
T wave measures the resting period of the ventricles.
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