Once asleep again, the muscles relax and the airway becomes blocked, cutting off the airway again. This cycle can occur hundreds of times per night. Obstructive Sleep Apnea is the most common form of sleep apnea. It ranges in severity from mild to moderate, to severe. Other forms of sleep apnea include Central and Mixed Sleep Apnea.
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ADP. The product of ATP hydrolysis. ADP stands for Adenosine DiPhosphate since ADP contains two (Di) phosphate groups rather than ATP's three. The actual hydrolysis reaction involves ATP + H 2 O â ADP + Pi + energy. This reaction is not spontaneously reversible but instead requires a substantial input of energy is required to convert ADP back to ATP. See glycolysis, cellular respiration, and photosynthesis for discussions of this latter process.