Final answer:
Orthostatic hypotension is the term used for the condition when a patient who has been recumbent for some time gets up quickly and experiences light-headedness or faintness. It happens due to a decrease in blood flow to the brain when blood pressure drops below the homeostatic set point when standing.
Step-by-step explanation:
When a patient who has been recumbent for some time gets up quickly, they may suffer from light-headedness or feel faint. This condition is referred to as orthostatic hypotension. Orthostatic hypotension occurs when blood pressure goes below the homeostatic set point when standing, resulting in a decrease in blood flow to the brain.