Which of the following factors determine cardiac stroke volume? ...

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Which of the following factors determine cardiac stroke volume? 1. Ventricular preload 2. Ventricular afterload 3. Ventricular contractility
 
  a. 1 and 2 only
  b. 1 and 3 only
  c. 2 and 3 only
  d. 1, 2, and 3

Question 2

What is an approximate normal resting cardiac output for a healthy adult?
 
  a. 75 ml/min
  b. 500 ml/min
  c. 2000 ml/min
  d. 5000 ml/min

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Answer to Question 1

ANS: D
Stroke volume is affected chiefly by intrinsic control of three factors: (1) preload, (2) afterload, and (3) contractility.

Answer to Question 2

ANS: D
A normal resting cardiac output of approximately 5 L/min can be calculated by substituting a normal heart rate (70 contractions/min) and stroke volume (75 ml, or 0.075 L, per contraction).
Cardiac output = 70 beats/min  0.075 L/beat = 5.25 L/min.