Open Water Course Review Questions with Correct Answers Verified by
Experts| Latest Update
Nitrogen at a high partial pressure causes a narcotic effect by packing the myelin sheath and
slowing nerve impulses
Nitrogen Narcosis happens at what depth typically 30 meters (4 bar pressure, 3.2 ppN2)
Symptoms at increasing depths light headed ness
unusual behavior
loss of dexterity
dizziness
abnormal vision or hearing
inability to reason or follow plan
carelessness about well being
short term memory loss (losing track of time)
Nitrogen Narcosis Treatment ascend to a shallower depth
Oxygen breathed under a partial pressure that is too high is poisonous (1.6bar ppO2, 65
meters (6 meters for pure oxygen)
O2 Toxicity Symptoms ConVENTID: Convulsions, visual problems, ear disorder, nausea,
twitching (most common), irritability and dizziness
Hypercapnia excessive carbon dioxide in the blood
Hypercapnia is associated with distress and anxiety, headache, confusion, drowsiness or
unconsciousness
, Hypercapnia Prevention Breathe continuously
Stay within the diving limits of 30 meters
minimize exertion with proper buoyancy
Co2 poisoning treatment air
pure oxygen
cpr
contact ems
Carbon Monoxide Poisoning -carbon monoxide binds with hemoglobin and reduces oxygen
supply to tissues
-placing a gas compressor too near the exhaust of a boat or from overheating the tank
Depth the deepest point reached during the dive (no matter how briefly you stayed there)
Bottom time The amount of elapsed time from the start of your descent until the start of
your ascent.
Total dive time The total amount of elapsed time from the start of your descent until you
reach the surface including ascent and decompression stop time.
surface interval The amount of time the diver stays out of the water or on the surface
between dives
Repetitive Dive Any dive started more than 10 minutes and less than 12 hours after a
previous dive.
Experts| Latest Update
Nitrogen at a high partial pressure causes a narcotic effect by packing the myelin sheath and
slowing nerve impulses
Nitrogen Narcosis happens at what depth typically 30 meters (4 bar pressure, 3.2 ppN2)
Symptoms at increasing depths light headed ness
unusual behavior
loss of dexterity
dizziness
abnormal vision or hearing
inability to reason or follow plan
carelessness about well being
short term memory loss (losing track of time)
Nitrogen Narcosis Treatment ascend to a shallower depth
Oxygen breathed under a partial pressure that is too high is poisonous (1.6bar ppO2, 65
meters (6 meters for pure oxygen)
O2 Toxicity Symptoms ConVENTID: Convulsions, visual problems, ear disorder, nausea,
twitching (most common), irritability and dizziness
Hypercapnia excessive carbon dioxide in the blood
Hypercapnia is associated with distress and anxiety, headache, confusion, drowsiness or
unconsciousness
, Hypercapnia Prevention Breathe continuously
Stay within the diving limits of 30 meters
minimize exertion with proper buoyancy
Co2 poisoning treatment air
pure oxygen
cpr
contact ems
Carbon Monoxide Poisoning -carbon monoxide binds with hemoglobin and reduces oxygen
supply to tissues
-placing a gas compressor too near the exhaust of a boat or from overheating the tank
Depth the deepest point reached during the dive (no matter how briefly you stayed there)
Bottom time The amount of elapsed time from the start of your descent until the start of
your ascent.
Total dive time The total amount of elapsed time from the start of your descent until you
reach the surface including ascent and decompression stop time.
surface interval The amount of time the diver stays out of the water or on the surface
between dives
Repetitive Dive Any dive started more than 10 minutes and less than 12 hours after a
previous dive.
