A&P Review - Cardiovascular System

Question 1

P wave

Answer 1

represents depolarization of atria
1st phase of cardiac cycle
normal length: 0.08-0.1 second
smooth and round shape

Question 2

Q wave

Answer 2

beginning of QRS complex
negative wave
normal range: <0.03 seconds

Question 3

R wave

Answer 3

predominant, positive part of ECG complex

Question 4

S wave

Answer 4

negative wave after R wave in ECG complex

Question 5

T wave

Answer 5

represents ventricular repolarization (recovery of the ventricle)
longer than QRS complex
smooth and round shape

Question 6

T wave

Answer 6

represents ventricular repolarization (recovery of the ventricle)
longer than QRS complex
smooth and round shape

Question 7

U wave

Answer 7

small wave after T wave also representing ventricular repolarization

Question 8

PR Interval

Answer 8

beginning of atrial depolarization to beginning of ventricular depolarization
normal range: 0.12-0.20 seconds
abnormal ranges: <0.12 = accelerated conduction; >0.20 = first degree heart block
decreases in length as HR increases

Question 9

QRS Complex

Answer 9

made up of the Q, R, S waves representing activation of both L and R ventricles (depolarization)
normal range: 0.06-0.1 seconds
abnormal range: >0.1 = impaired ventricular conduction