Short-term mechanisms for regulating blood pressure include regulating peripheral vascular resistance and cardiac output through:-

Dilation or constriction

Explanation:

Short-Term mechanism for regulating blood pressure include regulating peripheral vascular resistance and cardiac output through dilation or constriction of the blood vessels while on the other hand, long-term mechanism for controlling of blood pressure done by the renin-angiotensin system. Brains stem is the part of the brain that is responsible for the controlling of blood pressure in the body.