Final answer:
The stroke volume will decrease when baroreceptor firing decreases and the cardiac centers increase sympathetic stimulation and decrease parasympathetic stimulation.
Step-by-step explanation:
In the absence of compensations, the stroke volume will decrease when baroreceptor firing decreases and the cardiac centers increase sympathetic stimulation and decrease parasympathetic stimulation. Baroreceptors are blood-pressure receptors that detect a decrease in blood pressure, signaling the heart to increase its rate and/or strength of contractions to compensate for the lowered blood pressure.