Diving Physiology
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Setting
Passing score
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Display Point Value
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Randomize Questions
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Total Number of Questions
35
Total Number of Questions to Ask
All
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Display Passing Score
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Questions
Multiple Choice, 10 points, 1 attempt(s) permitted.
1. From a diving perspective the ________ are the last tissues to become saturated with inert gas.
Correct
Choice
Feedback
X
bones
Correct
muscles
Incorrect, bones are the last to become
saturated due to limited blood supply.
brain and spinal cord
Incorrect, bones are the last to become
saturated due to limited blood supply.
digestive system
Incorrect, bones are the last to become
saturated due to limited blood supply.
Matching Drag and Drop, 10 points, 1 attempt(s) permitted.
2. Match the basic function with the body system.
Choice
Match
Musculoskeletal System
provides the structure around which the body the
body is formed; provides protection for vital organs;
causes movement by contracting
Nervous System
uses approximately 20% of the blood's available
oxygen supply
Digestive System
converts food to a form that can be transported and
utilized by the cells
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Choice, 10 points, 1 attempt(s) permitted.
3. Respiration is the process of getting oxygen into the body and carbon dioxide out. Select the
correct path of gas being inhaled:
Correct
X
Choice
Feedback
Nose/mouth, trachea, bronchi, bronchioles,
alveoli
Currect
Nose/mouth, bronchi, bronchioles, trachea,
alveoli
Incorrect, the correct path is: Nose/mouth,
trachea, bronchi, bronchioles, alveoli
Nose/mouth, alveoli, trachea, bronchi,
bronchioles
Incorrect, the correct path is: Nose/mouth,
trachea, bronchi, bronchioles, alveoli
Nose/mouth, trachea, alveoli, bronchi,
bronchioles
Incorrect, the correct path is: Nose/mouth,
trachea, bronchi, bronchioles, alveoli
True/False, 10 points, 1 attempt(s) permitted.
4. The lungs contain five lobes; three for the right lung and two for the left.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Choice, 10 points, 1 attempt(s) permitted.
5. The single cell, semi-permeable, wall separating _____ and capillary is where the gas exchange
between lungs and blood flow takes place.
Correct
Choice
Feedback
X
alveoli
Correct
bronchioles
Incorrect, the cell wall separating alveoli and
capillary is where the gas exchange between
lungs and blood flow takes place.
bronchi
Incorrect, the cell wall separating alveoli and
capillary is where the gas exchange between
lungs and blood flow takes place.
trachea
Incorrect, the cell wall separating alveoli and
capillary is where the gas exchange between
lungs and blood flow takes place.
Multiple Choice, 10 points, 1 attempt(s) permitted.
6. During the normal mechanics of respiration the diaphragm _____ on inhalation and _____
during exhalation.
Correct
X
Choice
Feedback
contracts / relaxes
Correct
relaxes / contracts
Incorrect. During the normal mechanics of
respiration the diaphragm contracts on
inhalation and relaxes during exhalation.
pushes / pulls
Incorrect. During the normal mechanics of
respiration the diaphragm contracts on
inhalation and relaxes during exhalation.
constricts / expands
Incorrect. During the normal mechanics of
respiration the diaphragm contracts on
inhalation and relaxes during exhalation.
Multiple Choice, 10 points, 1 attempt(s) permitted.
7. The need to breathe is controlled by _____ levels in the body.
Correct
X
Choice
Feedback
carbon dioxide
Correct
oxygen
Incorrect. Carbon dioxide levels in the body
control the need to breathe.
carbon monoxide
Incorrect. Carbon dioxide levels in the body
control the need to breathe.
nitrogen
Incorrect. Carbon dioxide levels in the body
control the need to breathe.
Multiple Choice, 10 points, 1 attempt(s) permitted.
8. The ______ brings oxygenated blood from the lungs to the heart.
Correct
X
Choice
Feedback
pulmonary vein
Correct
pulmonary artery
Incorrect. The pulmonary vein brings
oxygenated blood from the lungs to the heart.
aorta
Incorrect. The pulmonary vein brings
oxygenated blood from the lungs to the heart.
superior vena cava
Incorrect. The pulmonary vein brings
oxygenated blood from the lungs to the heart.
Multiple Choice, 10 points, 1 attempt(s) permitted.
9. At sea level, about 98% of the oxygen in the blood is carried by _____.
Correct
X
Choice
Feedback
hemoglobin
Correct
plasma
Incorrect. At sea level, about 98% of the
oxygen in the blood is carried by hemoglobin.
water
Incorrect. At sea level, about 98% of the
oxygen in the blood is carried by hemoglobin.
carbon dioxide
Incorrect. At sea level, about 98% of the
oxygen in the blood is carried by hemoglobin.
True/False, 10 points, 1 attempt(s) permitted.
10. Most carbon dioxide reacts with water in the blood cells and is transported into bicarbonate
ions, many of which diffuse into the blood plasma for transport to the lungs.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
11. Oxygen and carbon dioxide diffuse across tissues from areas of lower concentration to areas of
higher concentration.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Choice, 10 points, 1 attempt(s) permitted.
12. At rest, the body inhales approximately _____ oxygen and exhales about _____ oxygen.
Correct
X
Choice
Feedback
21% / 16%
Correct
25% / 10%
Incorrect. At rest, the body inhales
approximately 21% oxygen and exhales about
16% oxygen.
21% / 25%
Incorrect. At rest, the body inhales
approximately 21% oxygen and exhales about
16% oxygen.
21% / 4%
Incorrect. At rest, the body inhales
approximately 21% oxygen and exhales about
16% oxygen.
True/False, 10 points, 1 attempt(s) permitted.
13. People who are aerobically fit are able to deliver, extract, and use more oxygen when
exercising.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Matching Drag and Drop, 10 points, 2 attempt(s) permitted.
14. Match the respiratory problem with its description.
Choice
Match
Hypoxia
results when tissue oxygen pressure drops below
normal from an inadequate supply of oxygen
Hyperventilation
short term, rapid deep breathing beyond the need for
the activity; lowers carbon dioxide level in blood
Hypercapnia
occurs from too much carbon dioxide in the breathing
gas, or because carbon dioxide produced by the body
is not eliminated properly
Shallow Water Blackout
falling ambient pressure during ascent reduces the
partial pressure of oxygen in the body; can cause
unconsciousness
Carbon Monoxide Poisoning
results from contamination of a scuba cylinder by
fumes from the exhaust of an internal combustion
engine or partial combustion of compressor lubricating
oil
Lipoid Pneumonia
can result if a diver breaths gas containing suspended
petroleum vapor
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
15. Swallowing, yawing, or the Valsalva Maneuver are acceptable methods to equalize the
pressure increase on the middle ear experienced during decent.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
16. Over the counter and prescription drugs can open sinus passages with no risk to diving
situations.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
17. On a breath-hold dive, the lungs compress with increased depth. This compression does not
correlate completely to the pressure-volume relationship of Boyle's law.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
18. An "eye squeeze" is caused by negative pressure creating suction in the mask when a diver
descends without equalization.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
19. To clear a reverse block, the diver should Valsalva as they ascend.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Matching Drag and Drop, 10 points, 2 attempt(s) permitted.
20. Match the lung overexpansion injury with its signs and symptoms.
Choice
Match
Pneumothorax
difficulty or rapid breathing; leaning toward the
affected side; deep breathing hurts; decreased or
absent lung sounds on affected side; death
Mediastinal Emphysema
pain under the sternum that may radiate to the neck,
collarbone, or shoulder; swelling around the neck; a
brassy quality to the voice; cough; deviation of the
Adams apple to the affected side
Subcutaneous Emphysema
feeling of fullness in the neck area, swelling or inflation
around the neck and upper chest; crackling sensation
when skin is palpated; change in sound of voice; cough
Arterial Gas Embolism
chest pain; cough or shortness of breath; bloody,
frothy sputum; headache; visual disturbances;
numbness or tingling; weakness or paralysis; loss of, or
change in, sensation over part of the body; dizziness;
confusion; sudden unconsciousness, death
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Choice, 10 points, 1 attempt(s) permitted.
21. The treatment common to all lung overexpansion injuries is:
Correct
X
Choice
Feedback
administrator 100% oxygen
Correct
recompression in a chamber
Incorrect. The common treatment for all lung
overexpansion injuries is to administer 100%
oxygen.
place the diver in a sitting position
Incorrect. The common treatment for all lung
overexpansion injuries is to administer 100%
oxygen.
administer fluids by mouth
Incorrect. The common treatment for all lung
overexpansion injuries is to administer 100%
oxygen.
Multiple Response, 10 points, 2 attempt(s) permitted.
22. There are ways to minimize the risk of lung overexpansion injuries while diving. Select all that
apply. There are at least four correct answers.
Correct
Choice
X
Never hold your breath when diving compressed gasses
X
Ascend slowly while breathing normally
X
Don't dive with a chest cold or obstructed air passages
X
Carry sufficient quantities of gas to complete the dive
Ascend at 30 feet per minute or slower
skip breathing
use of antihistamines
not exceeding your planned dive time
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Matching Drag and Drop, 10 points, 2 attempt(s) permitted.
23. Match the indirect effect of pressure with its description.
Choice
Match
Inert Gas Narcosis
a state of altered mental function ranging from mild
impairment of judgment or euphoria, to complete loss
of consciousness, produced by exposure to increased
partial pressure of nitrogen and certain other gases
High Pressure Nervous Syndrome
occurs at depths greater than 400 fsw (123 msw);
characterized by dizziness, nausea, vomiting;
twitching, decrements to performance, and poor sleep
with nightmares
CNS Oxygen Toxicity
an epileptic-like convulsion resulting from exposure to
high partial pressures of oxygen (typically above 1.6
atm)
Whole-Body Oxygen Toxicity
a slow developing condition resulting from exposure to
above normal partial pressures of oxygen
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
24. The speed at which a given tissue group absorbs or eliminates an inert gas is dependent on the
blood supply and makeup of the tissue.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
25. On ascent, the diver's tissues, especially slow compartments, may continue to absorb nitrogen.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
26. Adhering to accepted decompression limits and proper ascent rates is guarantee to avoiding
decompression sickness.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Response, 10 points, 1 attempt(s) permitted.
27. While you can do everything correctly and still suffer DCS, prevention can be enhanced if you:
(Select all that apply. There are at least 5 correct answers.)
Correct
Choice
X
Ascend slowly (30 feet per minute)
X
Make safety stops
X
Use longer surface intervals
X
Plan the dive, dive the plan, and have a backup plan
X
Maintain good physical fitness, nutrition, and hydration
Use a dive computer rather than dive tables
Avoid "reverse profile dives" at all cost
Exercise post dive
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Choice, 10 points, 1 attempt(s) permitted.
28. Aseptic Bone Necrosis is an occupational hazard of professional divers and others exposed to
hyperbaric stresses. The _____ and _____ are most often affected.
Correct
X
Choice
Feedback
hip / shoulder
Correct
elbow / wrist
Incorrect. The hip and shoulder are most often
affected by Aseptic Bone Necrosis.
ankles / long bone shafts
Incorrect. The hip and shoulder are most often
affected by Aseptic Bone Necrosis.
knee / vertebra
Incorrect. The hip and shoulder are most often
affected by Aseptic Bone Necrosis.
Multiple Choice, 10 points, 1 attempt(s) permitted.
29. It is estimated _____ is present in 20-30% of the general population. This condition can cause
severe problems for affected divers by allowing bubbles accumulated during a dive to be shunted
from one side of the heart to the other, bypassing the lungs.
Correct
X
Choice
Feedback
Patent Foramen Ovale (PFO)
Correct
Arterial Gas Embolism (AGE)
Incorrect. The condition is Patent Foramen
Ovale (PFO).
Capillary Bed Lesions (CBL)
Incorrect. The condition is Patent Foramen
Ovale (PFO).
Mitral Valve Defect
Incorrect. The condition is Patent Foramen
Ovale (PFO).
True/False, 10 points, 1 attempt(s) permitted.
30. Women should not dive during pregnancy.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Response, 10 points, 1 attempt(s) permitted.
31. Select all that apply to hypothermia.
Correct
Choice
X
susceptibility increases with dehydration, fatigue, hunger, and illness
X
susceptibility increases if you are out of shape, underweight, a smoker, or using drugs or alcohol
keeping your wetsuit on between dives is a good prevention strategy
minimize exposure by efficient pre-dive preparations and cooling down as needed
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
32. Hypothermia and Hyperthermia can occur irrespective of ambient temperature.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
33. Beta blockers, motion sickness medications, and antihistamines have been shown to have no
affect on diver performance, the ability to thermoregulate, or diver safety.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
34. Smoking reduces the oxygen carrying capacity of the blood and may predispose the diver to
DCS.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
35. Alcohol protects a diver from thermal stress.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect