Answer to Question 1
Ans: C
Parasympathetic stimulation via the vagus nerve decreases the heart rate. The Valsalva maneuver stimulates the vagus nerve, resulting in a slower pulse rate.
Answer to Question 2
Ans: B
The pulse is regulated by the autonomic nervous system through the cardiac sinoatrial node. The other anatomic sites may affect, but do not regulate, the pulse rate and force.