The “bends” or decompression sickness is a formof air embolism. When scuba or deep sea diversare under higher pressure, more nitrogen gasdissolves in the blood and tissue fluids. Usually aslow ascent to the surface (lower pressure) allowsthe gas to be gradually dissipated and exhaled. Ifa diver rises to the surface too rapidly, the gascomes out of solution, forming bubbles or gasemboli in the circulation. Explain why ischemiaand pain may occur in various tissues such asmuscle, joints, or the heart.

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