Ex 14

Question 1

Parts of an EKG

Answer 1

P wave, QRS complex, T wave, PR interval, QT interval, QRS interval, PQ segment, ST segment

Question 2

What does the P wave of an EKG represent

Answer 2

atrial contraction (depolarization)

Question 3

What is the typical duration and amplitude of the P wave?

Question 4

What would cause abnormalities in a P wave?

Answer 4

enlargement of the heart, hormone imbalances, conduction pathway abnormalities

Question 5

What does the Q wave of an EKG represent?

Answer 5

initial ventricular depolarization

Question 6

What does the R wave of an EKG represent?

Answer 6

ventricular depolarization

Question 7

What does the S wave of an EKG represent?

Answer 7

final ventricular depolarization

Question 8

What does the QRS complex of an EKG represent

Answer 8

ventricular depolarization

Question 9

What does the T wave of an EKG represent

Answer 9

ventricular repolarization

Question 10

What does the PR interval of an EKG represent

Answer 10

signal conduction through AV node before activating ventricles

Question 11

What does the QT interval of an EKG represent

Answer 11

duration of ventricular depolarization; shorter during exercise

Question 12

What does the QRS interval of an EKG represent

Answer 12

atrial repolarization and diastole; repolarization concealed by QRS wave

Question 13

What does the PQ segment of an EKG represent

Answer 13

signal conduction from SA node to AV node; atrial systole begins

Question 14

What does the ST segment of an EKG represent

Answer 14

ventricular systole and ejection of blood; corresponds to plateau of cardiomyocyte action potential

Question 15

Describe tachycardia

Answer 15

fast heart rate at rest

Question 16

Describe bradycardia

Answer 16

slow heart rate at rest