Question

multiple choice question
how does stimulation by the sympathetic nervous system increase stroke volume?

increases the heart rate
increases the force of contraction
decreases afterload
decreases cardiac output

Explanation:

The sympathetic nervous system increases stroke volume by increasing the force of contraction of the heart muscle. While increasing heart rate can affect cardiac output, it's not the direct way to increase stroke - volume. Decreasing afterload is not the main mechanism by which the sympathetic nervous system increases stroke volume, and decreasing cardiac output is the opposite of what occurs when stroke volume increases.

Answer:

Increases the force of contraction