Within a normal physiologic range, an increase in left ...

[jenna1]

Within a normal physiologic range, an increase in left ventricular end-diastolic volume would lead the nurse to monitor for:
 
  a. an increased force of contraction.
  b. a decrease in cardiac output.
  c. an increase in heart rate.
  d. heart failure.

Question 2

What are the thickened areas of the sarcolemma of myocardial cells that enable electrical impuls-es to travel in a continuous cell-to-cell fashion called?
 
  a. Myosins
  b. Intercalated disks
  c. Troponin Ts
  d. I bands

[wshriver]

Answer to Question 1

ANS: A
An increase in end-diastolic volume leads to an increased force of contraction because fibers are stretched to handle increased volume. Cardiac output would increase. Although volume increas-es, heart rate does not respond accordingly. An increase in end-diastolic volume would not lead to heart failure since failure results in output decrease.

Answer to Question 2

ANS: B
Intercalated disks allow electrical impulses to be transmitted rapidly from cardiac fiber to cardiac fiber because the network of fibers is connected at these disks. Myosins do not play a role in conduction. Troponin Ts are involved in contraction but are not part of the sarcolemma. I bands are a part of the filaments bud, which do not conduct impulses in a cell-to-cell fashion.