Lecture 3 Flashcards Preview

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Flashcards in Lecture 3 Deck (6)
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1
Q

animal models: what factor important for autonomic response?

how?

A

animal models: predator imminence

no imminent threat: cardiac deceleration

> orienting reflex + freezing

immiment threat: cardiac acceleration

> defense reflex + fight or flight

2
Q

what is the PEP

A

PEP: pre ejection period

> start contraction left ventricle until opening aortic valve

3
Q

what is LVET

A

LVET: left ventricular ejection time

> opening aortic valve until closing aortic valve

4
Q

how does the SNS influence PEP?

A

sympathetic nervous system activity increases cardiac contractility

> left ventricle contracts stronger/faster

> shorter PEP

5
Q

what is HPV?

what does it reflect?

how?

A

HRV: heart period variability

HPV reflects parasympathetic nervous system activity

> when PNS activity increases, vagal gating effects become larger > HPV increases

6
Q

how can you measure PNS activity?

A

PNS activity is reflected in respisatory sinus arrhytmia

RSA = longest heart period during exhalation - shortest heart period during inhalation