EKG

Question 1

QRS complex

Answer 1

AV node excites ventricles: ventricular depolarization, atrial repolarization

Question 2

AV node

Answer 2

carries action potential to bundle of his

Question 3

T wave

Answer 3

repolarization of ventricles back to resting state

Question 4

Atrial/ventricular diastole

Answer 4

blood flows into heart, AV valves open, semilunar valves closed, 0.4 seconds

Question 5

P wave

Answer 5

begins when SA node generates action potentials: atrial depolarization

Question 6

3 steps of EKG

Answer 6

1. Atrial/ventricular diastole (filling)
2. Atrial systole, ventricular
   diastole
3. Ventricular systole, atrial
   diastole

Question 7

what happens before contraction

Answer 7

depolarization

Question 8

Atrial Systole, Ventricular diastole

Answer 8

Atrial contacts (forces blood in ventricle), all valves are closed at end of phase, 0.1 second

Question 9

myogenic

Answer 9

not under control of brain

Question 10

Ventricular systole, atrial diastole

Answer 10

ventricles contract, AV valves closed, semilunar vales open, 0.3 seconds

Question 11

bundle of his

Answer 11

muscle fiber that carries electrical signals from atria to ventricles

Question 12

SA node (pacemaker)

Answer 12

cause action potential in heart