Lec 12 - Cardiac Electrophysiology

Question 1

Fastest conducting part of heart

Answer 1

Purkinje fibers

Question 2

Slowest conduction in the heart

Answer 2

Sa node

Question 3

Sa node, av node, and purkinje fibers are blank

Answer 3

Redundant pacemakers

Question 4

Av and sa nodes are slower conduction because they are blank

Answer 4

Calcium dependent

Question 5

Blank conductance increases slowly during depolarization which makes the action potential longer in the heart

Answer 5

Calcium

Question 6

S3 is an blank

Answer 6

Extra systole (heart palpatation)

Question 7

Fast depolarization causes HR to blank

Answer 7

Increase

Question 8

Slow depolarization causes HR to

Answer 8

Decrease

Question 9

Positive chronotropic blank parasympathetic and blank sympathetic

Answer 9

Decreases, increases

Question 10

Negative chronotropic blank parasympathetic and blank sympathetic

Answer 10

Increases, decreases

Question 11

Slow HR less than 60 bpm

Answer 11

Bradycardia

Question 12

Normal evenly spaced hr between 60-100

Answer 12

Normal sinus rhythm

Question 13

Normal evenly spaced HR greater than 100 bpm

Answer 13

Tachycardia

Question 14

BIG PICTURE: Sequence of events inititating myocardial contraction

Answer 14

Cardiac ap, electromechanical coupling, myofilament contraction