ECG basics

Question 1

define depolarisation

Answer 1

one cell can be the stimulus for depolarisation of the adjoining cells and so a wave of contraction passes through the cells

Question 2

Define repolarisation

Answer 2

is the depolarised cell returning to the resting position and getting ready for the next contraction

Question 3

what nervous sytems increase or decrease HR?

Answer 3

SNS- increases HR
PSNS- decreases HR

HR regulated by autonomic NS

Question 4

Ectopic focus definition

Answer 4

site that generates an ectopic beat

Question 5

Name some characteristics of a myocardical infarction

Answer 5

-ST segment elevation over area of damage
-ST depression in leads oppostie infarction
-Pathological Q waves
-Reduced R waves
-Inverted T waves