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Micro Physiology > Lecture 25- Electrophysiology Pt.2 > Flashcards

Lecture 25- Electrophysiology Pt.2 Flashcards

1
Q

Which ion is responsible for the initial cardio myocyte depolarization?
What is its speed?

A

Fast Na channels

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2
Q

What ion is responsible for the plateau of the action potential?
Are its channels fast or slow?

A

Slow Ca channels

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3
Q

What ion channel is responsible for repolarization of cardiomyocytes?

A

K channels

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4
Q

Is sympathetic or parasympathetic innervation diffuse?

A

Sympathetic

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5
Q

What is part of the heart receives sympathetic innervation?

A

SA node
AV node
Myocardium

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6
Q

What neurotransmitter are used during myocardial sympathetic activation?

A

E and NE

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7
Q

What part of the heart does parasympathetic activation act on?

A

SA and AV nodes

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8
Q

What NT is used in parasympathetic myocardial activation?

A

Ach

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9
Q

What is Chronotropic effect?

A

Change in the sinus rate

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10
Q

What does dromotropic mean?

A

Change in the rate of conduciton

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11
Q

What node does the dromotropic effect act on?

A

The AV node

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12
Q

Which have normal automaticity?
Specialized conduction cells or working cardiomyocytes?

A

Specialized conduction cells

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13
Q

Which way does a wave of depolarization between two leads run?

A

Towards the positive electrode

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14
Q

When does a voltmeter record a charge?
Cells at reset?
Depolarization?
Depolarized cells?

A

Depolarization- some cells depolarized, others not

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15
Q

A positive deflections is recorded on a ECG when…

A

depolarization is moving towards the electrode

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16
Q

What is the direction of depolarization

A

right to left
cranial to caudal
dorsal to ventral

17
Q

What is the P wave?

A

Atrial depolarization

18
Q

What is the QRS wave

A

Ventricular depolarization

19
Q

What is the T wave

A

Repolarization of the ventricles

20
Q

Which wave can be positive or negative in cats and dogs?

A

T wave

21
Q

How many ECG boxes per second at 50mm/sec and 25mm/sec

A

10 and 5

22
Q

What is the MEA (mean electrical axis?

A

Dominant direction of depolarization

23
Q

Which limb will register the electrical signal more strongly?

A

LR

24
Q

What is a normal change in HR with inspiration?

A

Sinus arrhythmia

25
Q

Where is normal QRS origin?

A

Supraventricular

26
Q

How to calculate mean HR on ECG at 50mm/sec

A

of complexes in 30 boxes(3sec) x 20

27
Q

How many seconds does a pen represent on a 50mm/sec EKG

A

3

28
Q

How many seconds does a pen represent on a 25 mm/sec EKG?

A

6

29
Q

What does it mean if the QRS is abnormally wide

A

Ventricular origin of contraction

Micro Physiology (35 decks)

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