Author Question: Explain the Frank-Starling law of the heart. What will be an ideal ... (Read 32 times)

jeatrice · **on:** Jun 25, 2018

Explain the Frank-Starling law of the heart.

What will be an ideal response?

Question 2

The second letter of the pacemaker identification code represents _____.

a. programmable functions
b. the chamber sensed
c. the mode of response
d. the chamber paced

nital · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

According to the Frank-Starling law of the heart, to a point, the greater the volume of blood in the heart during diastole, the more forceful the cardiac contraction, and the more blood the ventricle will pump (stroke volume). This is important so that the heart can adjust its pumping capacity in response to changes in venous return, such as during exercise. If, however, the ventricle is stretched beyond its physiologic limit, cardiac output may fall because of volume overload and overstretching of the muscle fibers.

Answer to Question 2

B
The second letter of the pacemaker code identifies the chamber of the heart where patient-initiated (i.e., intrinsic) electrical activity is sensed by the pacemaker.