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2️⃣ Midterms
⚓️ C45. Deep Sea Physiology
2. SCUBA
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Cards (11)
What does SCUBA stand for?
Self-Contained
Underwater
Breathing
Apparatus
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Who popularized SCUBA in 1943?
Jacques Cousteau
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What type of SCUBA system is used in over 99% of diving?
Open-circuit demand system
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What are the main components of an open-circuit SCUBA system?
Tanks of
compressed air
or breathing mixture
First-stage reducing valve
Inhalation demand valve and
exhalation valve
Mask and tube system with dead space
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What is the function of the first-stage reducing valve in SCUBA?
It reduces
high pressure
to
low pressure
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How does the demand valve work during inhalation?
It opens with
negative pressure
to release air
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What happens to the air during expiration in SCUBA?
It
is
expelled
into
the
water
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Why is there a limitation on the time one can remain underwater with SCUBA?
Due to the need for
airflow
to remove
CO2
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What is the effect of depth on airflow requirements in SCUBA diving?
Greater depth requires more airflow per
minute
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How long can a diver typically remain at a 200-foot depth?
Only a few
minutes
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What is the role of the mask in a SCUBA system?
Provides visibility underwater
Houses the
inhalation
and exhalation valves
Connects to the breathing tube
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