Lecture 7 - Exam #1 ECG Material Flashcards Preview

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Flashcards in Lecture 7 - Exam #1 ECG Material Deck (11):
1

PNS Stimulation primarily innervates what part of heart?

Nodal tissue

2

Uses ACh at pre-ganglionic synapse

SNS

3

Primarily innervates the ventricles

SNS

4

Utilizes ACh throughout all ganglia

PNS

5

What is responsible for the baseline of '0' mV on an ECG?

lack of current flow

6

normal P-R Interval

0.16 sec

7

Normal Q-T Interval

0.35 sec

8

Mechanism of SNS on heart (not the NT, but HOW it changes heart rate).

Increased Na/Ca influx produces (+) ino/chrono/dromotropic effects

9

Mechanism of PNS changes to heart (not NT, but actual. Echo is. Of changing HR)

Believed to be an increase in K+ efflux

10

Velocity of blood in aorta

Approximately 40cm/s

11

Describe the mechanism behind almost constant forward blood flow, even during diastole.

Elastic nature of arterial walls causes the to "spring back" after deformation during systole. This "squeezes" blood forward during diastole.