PhysioLec: Cardiac Electrophysiology

Question 1

TRUE OR FALSE: Increasing the slope of phase 4 will produce tachycardia.

Answer 1

True

Question 2

TRUE OR FALSE: The AV node has the slowest conduction velocity

Answer 2

True

Question 3

TRUE OR FALSE: The slow response has a stable RMP.

Answer 3

False

Question 4

TRUE OR FALSE: In a first degree heart block, the purkinje will become the pacemaker

Answer 4

False

Question 5

TRUE OR FALSE: Increased in K+ conductance leads to bradycardia

Answer 5

True

Question 6

TRUE OR FALSE: The lesser the rhythmicity, the less likely it would become the pacemaker.

Answer 6

True

Question 7

TRUE OR FALSE: The final repolarization is due to K+ efflux

Answer 7

True

Question 8

TRUE OR FALSE: It would be more beneficial to stimulate cardiac activity if stimulated at the supranormal period.

Answer 8

False

Question 9

TRUE OR FALSE: During fever, the heart rate is faster.

Answer 9

True

Question 10

TRUE OR FALSE: Phase 0 of the fast response is due to massive Na+ influx.

Answer 10

True

Question 11

TRUE OR FALSE: Fast response action potential is exhibited by AV node

Answer 11

False

Question 12

TRUE OR FALSE: The Slow response action potential has an absent phase 1.

Answer 12

True

Question 13

TRUE OR FALSE: Depolarization goes from epicardial to endocardial.

Answer 13

False

Question 14

TRUE OR FALSE: The depolarization of the slow response is due to voltage-gated Na+ channel opening.

Answer 14

False

Question 15

TRUE OR FALSE: At a threshold potential of –30mV, it will produce tachycardia.

Answer 15

False

Question 16

TRUE OR FALSE: The colder the core body temperature, the slower the heart rate.

Answer 16

True

Question 17

TRUE OR FALSE: Fast response is exhibited by atrial muscles.

Answer 17

True

Question 18

TRUE OR FALSE: The plateau is due to Ca++ efflux.

Answer 18

False

Question 19

TRUE OR FALSE: In the slow response, an increased RMP will produce bradycardia.

Answer 19

False

Question 20

TRUE OR FALSE: The fast response action potential has a plateau phase.

Answer 20

True