Final answer:
True. Obstruction due to thrombosis is the most common cause of ischemia in any arterially supplied region of the body.
Step-by-step explanation:
True. Obstruction due to thrombosis, or the formation of blood clots, is indeed the most common cause of ischemia in any arterially supplied region of the body. When a blood clot forms and blocks the flow of blood through an artery, it reduces or completely cuts off the supply of oxygen and nutrients to the tissues downstream from the blockage. This can lead to tissue damage or death if not treated promptly.