The axes of leads I, II, and III form an equilateral triangle with the heart at the center ...

The axes of leads I, II, and III form an equilateral triangle with the heart at the center (Einthoven's triangle).
 
  If the augmented limb leads are added to this configuration and the axes of the six leads moved in a way in which they bisect each other, the result is the _____ _____ _____.
 
  Fill in the blanks with correct word

Question 2

_____ is the ability of cardiac cells to spontaneously initiate an electrical impulse without being stimulated from another source.
 
  Fill in the blanks with correct word

Question 3

What factors affect stroke volume?
 
  What will be an ideal response?

Question 4

The PR interval of a first-degree AV block _____.
 
  a. is constant and less than 0.12 seconds in duration
  b. is constant and more than 0.20 seconds in duration
  c. is generally progressive until a P wave appears without a QRS complex
  d. gradually decreases in duration until a P wave appears without a QRS complex

Question 5

The PR interval is considered prolonged if it is more than _____ seconds in duration.
 
  a. 0.06
  b. 0.12
  c. 0.18
  d. 0.20