PADI Physiology Questions And Correct
Answers (Verified Answers) 2026/2027
How do you avoid dead air space problems? - CORRECT ANSWER -Breathe slowly
and deeply.
How do skin divers prepare for a breath hold dive? - CORRECT ANSWER -They use
deep-stomach breathing
What is the name of the lung overexpansion injury that occurs when a lung
collapses?
a) pneumothorax
b) subcutaneous emphysema
c) air embolism
d) convulsion - CORRECT ANSWER -a) pneumothorax
If a diver complains of DCI symptoms immediately on reaching the surface, what is
the most likely cause? - CORRECT ANSWER -A lung overexpansion injury
What is the blanket term that covers both lung overexpansion injuries and
Decompression sickness? - CORRECT ANSWER -Decompression Illness
,What is the first aid procedure for a lung overexpansion injury? - CORRECT
ANSWER -Contact emergency medical servicesKeep the patient lying level,
administer Oxygen ( 100 pct. if possible ) and monitor the patients breathing.
Why do you feel discomfort in your ears while descending? - CORRECT ANSWER -
Pressure pushing your eardrum and surrounding tissues inwards.
What part of the ear is most affected while descending? - CORRECT ANSWER -The
middle ear
What symptoms are likely if you were to rupture your ear drum? - CORRECT
ANSWER -It can cause severe vertigo
If you are having difficulty with ear equalization, and you blow too hard against a
pinched noseyou could cause what injury? - CORRECT ANSWER -A round window
rupture.
If a diver had a tight neck seal, what would be the likely cause of light
headedness? - CORRECT ANSWER -Carotid sinus reflex
On a hot day, a diver in a full suit is complaining of nausea. He is sweating and has
cool, clammy skin. Is he suffering from Heat Stroke.. OR Heat Exhaustion? -
CORRECT ANSWER -He is suffering from Heat Exhaustion. Heat Stroke is worse
than Heat Exhaustion. With heat stroke, there would be no more sweating, and
the diver would have dry skin.So remember! Stroke is worse than Exhaustion.
, What is a pressure related injury called? ( It can happen on both ascent and
descent ) - CORRECT ANSWER -Barotrauma. If we were to analyse this word.. we
have Bar ( pressure ) and Trauma ( Injury )So, put them together and we have
Barotrauma = Pressure related injury.
What is the name given to tiny bubbles of Nitrogen that can found in a divers
blood after a dive, although no symptoms can be found ? - CORRECT ANSWER -
Silent Bubbles.
If a diver complains of difficulty breathing, tingling, and numbness almost
immediately after a dive they most probably have?
a) decompression sickness
b) seasickness
c) vertigo
d) lung over expansion injury - CORRECT ANSWER -d) lung over expansion injury
Excessive voluntary hyperventilation can cause ____________ while involuntary
hyperventilation can cause ________________?
a) Hypoxia, Hypercapnia
b) Hypercapnia, Hypocapnia
c) Hypocapnia, Hypercapnia
d) Hyperoxia, Hypoxia - CORRECT ANSWER -c) Hypocapnia, Hypercapnia
Answers (Verified Answers) 2026/2027
How do you avoid dead air space problems? - CORRECT ANSWER -Breathe slowly
and deeply.
How do skin divers prepare for a breath hold dive? - CORRECT ANSWER -They use
deep-stomach breathing
What is the name of the lung overexpansion injury that occurs when a lung
collapses?
a) pneumothorax
b) subcutaneous emphysema
c) air embolism
d) convulsion - CORRECT ANSWER -a) pneumothorax
If a diver complains of DCI symptoms immediately on reaching the surface, what is
the most likely cause? - CORRECT ANSWER -A lung overexpansion injury
What is the blanket term that covers both lung overexpansion injuries and
Decompression sickness? - CORRECT ANSWER -Decompression Illness
,What is the first aid procedure for a lung overexpansion injury? - CORRECT
ANSWER -Contact emergency medical servicesKeep the patient lying level,
administer Oxygen ( 100 pct. if possible ) and monitor the patients breathing.
Why do you feel discomfort in your ears while descending? - CORRECT ANSWER -
Pressure pushing your eardrum and surrounding tissues inwards.
What part of the ear is most affected while descending? - CORRECT ANSWER -The
middle ear
What symptoms are likely if you were to rupture your ear drum? - CORRECT
ANSWER -It can cause severe vertigo
If you are having difficulty with ear equalization, and you blow too hard against a
pinched noseyou could cause what injury? - CORRECT ANSWER -A round window
rupture.
If a diver had a tight neck seal, what would be the likely cause of light
headedness? - CORRECT ANSWER -Carotid sinus reflex
On a hot day, a diver in a full suit is complaining of nausea. He is sweating and has
cool, clammy skin. Is he suffering from Heat Stroke.. OR Heat Exhaustion? -
CORRECT ANSWER -He is suffering from Heat Exhaustion. Heat Stroke is worse
than Heat Exhaustion. With heat stroke, there would be no more sweating, and
the diver would have dry skin.So remember! Stroke is worse than Exhaustion.
, What is a pressure related injury called? ( It can happen on both ascent and
descent ) - CORRECT ANSWER -Barotrauma. If we were to analyse this word.. we
have Bar ( pressure ) and Trauma ( Injury )So, put them together and we have
Barotrauma = Pressure related injury.
What is the name given to tiny bubbles of Nitrogen that can found in a divers
blood after a dive, although no symptoms can be found ? - CORRECT ANSWER -
Silent Bubbles.
If a diver complains of difficulty breathing, tingling, and numbness almost
immediately after a dive they most probably have?
a) decompression sickness
b) seasickness
c) vertigo
d) lung over expansion injury - CORRECT ANSWER -d) lung over expansion injury
Excessive voluntary hyperventilation can cause ____________ while involuntary
hyperventilation can cause ________________?
a) Hypoxia, Hypercapnia
b) Hypercapnia, Hypocapnia
c) Hypocapnia, Hypercapnia
d) Hyperoxia, Hypoxia - CORRECT ANSWER -c) Hypocapnia, Hypercapnia
