padi IDC theory – SCUBA physiology

Q7
Excessive hyperventilation with apnea diving may cause?
d)   All of the above

Q8
After a dive a diver displays the signs and symptoms of tunnel vision and cherry red nail beds. What is the most likely cause?
a)    Decompression sickness
b)   Lung overexpansion injury
c)    Contaminated air poisoning
d)   All of the above