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