A61-year-old business executive with a long history of high blood pressure collapsed while jogging over the lunch hour. his jogging mate quickly contacted a police officer who carry the man to a hospital just down the road. at the hospital, an mri was performed that revealed a blockage of a major cerebral artery and ischemic changes to the portion of the brain supplied by that artery. with quick medical attention, the man was stabilized, and he slowly improved over the next three weeks. the following signs and symptoms did persist, however: - weakness of the facial and upper extremity muscles on the left side - loss of sensory discrimination when objects are placed into the left hand - significant mood and character changes. which artery was blocked?