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2024 Vet physiology > Exam 2: Lecture 17 > Flashcards

Exam 2: Lecture 17 Flashcards

1
Q

Whare the effects of the autonomic nervous system on the heart rate called

A

Chronotropic effects

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2
Q

does + or - chronotropic effects increase the heart rate

A

+

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3
Q

Does the SNS or PNS work on + chronotropic effects

A

SNS
- NE released from S nerve fibers and activates Beta-1 receptors in the SA node

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4
Q

What receptor in the SA node produces an increase in I subscrpit f (If)

A

Activation of Beta 1 receptors

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5
Q

What happens in phase 4 depolarization and decreasing the threshold AP?

A

the SA node is depolrized to threshold potenital more frequently and fires more AP’s = increased HR

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6
Q

Does + or - chronotropic effects decrease HR

A

-

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7
Q

Does the SNS or PNS use negative chronotropic effects on the heart to decrease HR

A

PNS

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8
Q

What neurotransmitter is used in PNS to decrease HR and activates muscerinic receptors in the SA node

A

Acetylcholine

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9
Q

Does negative chronotropic effects in I subscript f (If)

A

decrease HR due to inhibition of adenylyl cyclase system from Gi protein

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10
Q

what is dromotrophy

A

effects of the autonomic nervous system on conduction velocity

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11
Q

What is the outcome of a positive dromotrophy on conduction velocity

A

increases in conduction velocity

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12
Q

What is the outcome of negative dromotrophy on conduction velocity

A

decrease in conduction velocity

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13
Q

What is the most important physiological effects on the autonomic nervous system on conduction velocity and can alter the rate at which AP are conducted from the atria to the ventricles

A

AV node

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14
Q

Stimulation of the SNS or PNS can increase condution velocity

A

SNS

  • increase HR
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15
Q

Stimulation of the SNS or PNS can decrease conduction velocity

A

PNS

  • decrease HR
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16
Q

What does + and - chronotropic effects work on to increase or decrease HR

A

AV node

17
Q

What is the measurement of tiny potential differences on the surface of the body that reflect the eletrical activity of the heart

A

Electrocardiogram
- ECG
- EKG

18
Q

What wave / interval of the PQRS complex represents depolarization of the atria

A

P wave

19
Q

What wave / interval of the PQRS complex represents time of initial depolarization of the atria to the initial depolarization of the ventricles

A

PR interval

Includes the p wave and the PR segment

20
Q

What wave / interval of the PQRS complex includes the P wave and is sioeletric (flat) portion of the ECG / EKG that corresponds to the AV node conduction

A

PR interval

21
Q

What wave / interval of the PQRS complex also correlates with conduction time through the AV node

A

PR interval

22
Q

What wave / interval of the PQRS complex represents the cumulative time from first depolarization of the atria to first depolarization of the ventricles

A

PR interval

23
Q

Does an increase or decrease in conduction velocity through the AV node decrease the PR interval

A

increase

24
Q

Does an increase or decrease in the conduction velocity through the AV node increase the PR interval

A

decrease

25
Q

What wave / interval of the PQRS complex represents depolarization of all the ventricles

A

QRS complex

25
Q

What wave / interval of the PQRS complex represents the repolarization of the ventricles

A

T wave

26
Q

What wave / interval of the PQRS complex represents first ventricualr depolarization to last ventricluar repolarization

A

QT interval

27
Q

What wave / interval of the PQRS complex represents an isoeletric portion of the QT interval that correlates with the plateua of the ventricular action potential

A

QT interval

28
Q

How do you measure the HR using the PQRS complex

A

by counting the number of QRS complex’s per minute

29
Q

What is deinfed as the R-R interval (time btw one R wave and the next R wave)

A

Cycle length

30
Q

What is the result of the relationship between heart rate and refactory period increases in HR may be a factor in production of?

A

arrhythmias

2024 Vet physiology (76 decks)

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