Final answer:
Decreased cardiac output is compensated for through an increase in heart rate and/or strength of contractions, as well as vasoconstriction of arterioles and constriction of veins.
Step-by-step explanation:
Decreased cardiac output can be compensated for by several mechanisms. One of these compensatory mechanisms is an increase in heart rate and/or strength of contractions. The baroreceptors in the aorta and carotid arteries detect the decrease in blood pressure, signaling the heart to increase its rate and/or strength of contractions to compensate for the lowered blood pressure. Additionally, vasoconstriction of the arterioles and constriction of the veins can help increase blood pressure and redirect blood to the tissues.