A patient's heart rate increased from 80 bpm to 160 bpm. The ...

[Deast7027]

A patient's heart rate increased from 80 bpm to 160 bpm. The nurse knows that what will follow is a(n)
 
  a. Increase in diastolic filling time.
  b. Decrease in cardiac output.
  c. Increase in stroke volume.
  d. Increase in contractility.

Question 2

Myocardial blood flow is unidirectional; the nurse knows that the correct pathway is which of the following?
 
  a. Right atrium, right ventricle, left ventricle, left atrium
  b. Right atrium, left atrium, right ventricle, left ventricle
  c. Right atrium, right ventricle, left atrium, left ventricle
  d. Right atrium, left atrium, left ventricle, right ventricle

[ApricotDream]

Answer to Question 1

ANS: B
An increased heart rate would decrease the diastolic filling time and stroke volume, thus decreasing overall cardiac output. A decrease in cardiac output results from decreased stroke volume and/or decreased heart rate. An increase in stroke volume and contractility would cause a decrease in heart rate to maintain cardiac output.

Answer to Question 2

ANS: C
Unoxygenated blood flows through the venae cavae into the right atrium, where it is pumped down to the right ventricle; the blood is then pumped out the pulmonary artery and is returned oxygenated via the pulmonary vein to the left atrium, where it flows to the left ventricle and is pumped out to the rest of the body via the aorta.

[Deast7027]

TYSM

[coreycathey]

Gracias!