Red muscle fibers are red because they contain large amounts of

Red muscle fibers are red because they contain large amounts of RED BLOOD CELLS. Red blood cells carry a protein known as hemoglobin. Hemoglobin is the oxygen carrying component of red blood cells. This substance is what gives blood its bright red color. Muscle cells will contain numerous red blood cells as these tissues require large amounts of oxygen to function efficiently.  

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

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