Final answer:
A stroke is a disruption of blood supply to the brain caused by a blockage in an artery. It can lead to the loss of specific brain functions.
Step-by-step explanation:
A stroke, also known as a disruption of blood supply to the brain, is caused by a blockage to an artery in the brain. The blockage can be from a blood clot, fat embolus, or air bubble. When blood cannot flow through the artery, the surrounding tissue is deprived of oxygen and nutrients, leading to cell death. Strokes can result in the loss of specific brain functions, such as movement, speech, or memory, depending on the area of the brain affected.