Bubbles form as gas comes out of tissues, not just blood. Generally gas in blood gets to the lungs where it then goes into the atmosphere, not recirculating round the body to become bigger bubbles. Bubbles come out of all tissues including spinal column, cartlidge. Bad decompression problems are generally those that damage nerves, Bubbles forming on the spine or brain stem, expand and put pressure on nerves, damaging and killing them & also stopping blood flow to these areas. Fizzy pop is a good analogy for what goes on. Fast release of pressure causes a mass of Bubbles.
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