Prepotential

Question 1

SA node depolarizes first,

Answer 1

establishing heart rate

Question 2

Changes in the membrane potential of a pacemaker
cell in the SA node that is establishing a heart rate of

Answer 2

72 beats per minute.

Question 3

SA node generates

Answer 3

80–100 action potentials per
minute

Question 4

Parasympathetic stimulation

Answer 4

slows heart rate

Question 5

AV node generates

Answer 5

40–60 action potentials per
minute

Question 6

The e Sinoatrial (SA) Node is located

Answer 6

posterior wall of right atrium

Question 7

SA node contains

Answer 7

pacemaker cells

Question 8

SA node is connected to AV nodes by

Answer 8

internodal pathways and this begins atrial activation

Question 9

AV node is located

Answer 9

• In floor of right atrium

Question 10

AV node recieves and delays

Answer 10

s impulse from SA node (Step 2)
and Delays impulse (Step 3)

atrial contraction begins

Question 11

The AV bundle is located

Answer 11

In the septum

Question 12

The AV bundle carries

Answer 12

impulse to left and right bundle branches
* Which conduct to Purkinje fibers (Step 4)

Question 13

AV bundle also carries impulse to moderator band

Answer 13

Which conducts to papillary muscles

Question 14

Purkinje fiber distribute

Answer 14

impulse through ventricles (steo 5)

Question 15

After Purkinje Fibers Distribute impulse through ventricles,

Answer 15

Atrial contraction is completed
* Ventricular contraction begin

Question 16

Bradycardia

Answer 16

abnormally slow heart rate

Question 17

Tachycardia

Answer 17

• abnormally fast heart rate