Ischemia or ischaemia is a restriction in blood supply to tissues, causing a shortage of oxygen that is needed for cellular metabolism (to keep tissue alive). Ischemia is generally caused by problems with blood vessels, with resultant damage to or dysfunction of tissue.
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Streaming and Blu-ray, but not cable. 4K streaming services Netflix, Amazon, Vudu and YouTube have the biggest selection of 4K movies and TV shows. A couple of less-popular services like Google Play Movies and TV, Sony's Ultra, Fandango Now and UltraFlix4K offer additional options. Hulu also has 4K now, but only on a couple of devices.