Phys 1 Cardiac Action Potentials

Question 1

Answer 1

Question 2

What portion of the tissue receives action potential before the other?

which ventricle’s epicardium receives action potential first?

Answer 2

Question 3

Conduction velocity

from high to low

explain why AV is the way it is?

Answer 3

Question 4

What is the pacemaker of the heart?

what is the difference that causes this?

Answer 4

Question 5

Answer 5

Question 6

Phase 4 in the SA and AV nodes

which gates open/close?

What else is this phase called?

Answer 6

Rhythmicity

Question 7

Phase 0

SA and AV nodes

what gates open/close?

What else is this called?

Answer 7

Action potential

Question 8

Cardiac action potentials

SA and AV nodes

what phases are missing?

why?

Answer 8

Question 9

Phase 3 SA and AV nodes

what gates open/close?

what else can it be called?

Answer 9

Reporlarization

Question 10

SA node vs AV node

what happens downstream?

Answer 10

Question 11

Phase 4 in fast tissues/fibers

also called what?

what gates are opened/closed?

Answer 11

Question 12

Phase 0 in fast tissues/fibers

also called what?

what gates are opened/closed?

Answer 12

Question 13

Phase 1 in fast tissues/fibers

also called what?

what gates are opened/closed?

Answer 13

Question 14

Phase 2 in fast tissues/fibers

also called what?

what gates are opened/closed?

Answer 14

Question 15

Phase 3 in fast tissues/fibers

also called what?

what gates are opened/closed?

Answer 15

Question 16

conduction velocity

what determines it?

Answer 16

Question 17

Defective conduction velocity

AV damage?

Purkinje fiber damage?

Answer 17

Question 18

Refractory periods

Answer 18

Question 19

ARP

RRP

SNP

Answer 19

General refractory periods

Question 20

What happens if conduction of action potential happens during RRP?

Answer 20

Question 21

Autonomic effects on action potentials

the 4 terms about speed rate strength and relaxiation?

Answer 21

Question 22

Autonomic effects on action potentials

Parasympathetics

what nerve?

to where?

Neurotransmitter?

receptor?

Answer 22

Question 23

Autonomic effects on action potentials

Parasympathetics

Chronotropic effects

Dromotropic effects

Answer 23

special K (b) channels will cause the hyperpolarization (it is Ach sensitive)

Question 24

Autonomic effects on ACtion potentials

Sympathetics

To what nodes?

Neurotransmitter?

Receptor?

Answer 24

Question 25

Autonomic effects on action potentials

Sympathetics

Chronotropic effects?

Dromotropic effects?

also what effects?

Answer 25

Question 26

Difference in action potential graphs for sympathetic and parasympathetic stimulation?

Answer 26

Question 27

Drugs what types do what?

Answer 27

Question 28

Question 29

are the resting membrane potential the same for ventricle atrium and SA node?

Answer 29

Question 30

what is voltage gated K channel?

Answer 30

will usually open during phase 3 to help repolarization