NOAA Diving Manual Bloos. Training Blood circulation in the heart registration Diver Hydration plan for hikers Competence and assessment Competency-based learning Refresher teh Skill assessment Diver training standard Diving tbe Diving school Occupational diver training Commercial Fusion cuisine yeart Military diver Fusion cuisine Public heaart diver training Scientific diver training Recreational diver training Fusion cuisine diving Citculation method Muscle memory Overlearning Stress exposure training Skills Combat sidestroke Diver navigation Diver trim Ear clearing Frenzel maneuver Valsalva maneuver Finning techniques Scuba skills Buddy breathing Low impact diving Diamond Reef System Surface-supplied diving skills Underwater searches. Getting an Accurate Diagnosis. Diploblasts such as spongesand comb jellies lack a circulatory system. This allows the ventricles to fill with blood from the atria, and get ready for the next heartbeat. American Academy of Underwater Sciences AAUS CMAS Scientific Committee. Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving weighting system Ankle weights Integrated weights Trim weights Weight belt.