Answer:
Altering blood volume.
Explanation:
Blood pressure may be defined as the pressure that exist while the blood circulation on the blood vessels walls. The blood pressure generally reflect the pressure of arteries in systemic circulation.
Various measures can be taken to control the blood pressure. The short-term controls are mediated by the blood borne chemicals and nervous system but they alters and changes the blood volume of an individual.
Thus, the answer is altering blood volume.
