Diving Physiology
Quiz settings
Property / SettingPassing score / 80%
Display Point Value / Yes
Randomize Questions / Yes
Total Number of Questions / 35
Total Number of Questions to Ask / All
Display User Score / Yes
Display Passing Score / Yes
Display Pass/Fail Messages / Yes
Email recipient
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 / FeedbackX / 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 / MatchMusculoskeletal 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 / Choice / FeedbackX / 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 / ChoiceX / 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 / FeedbackX / 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 / Choice / FeedbackX / 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 / Choice / FeedbackX / 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 / Choice / FeedbackX / 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 / Choice / FeedbackX / 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 / ChoiceX / 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 / ChoiceTrue
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 / Choice / FeedbackX / 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 / ChoiceX / 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 / MatchHypoxia / 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 / ChoiceX / 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 / ChoiceTrue
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 / ChoiceX / 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 / ChoiceX / 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 / ChoiceTrue
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 / MatchPneumothorax / 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 / Choice / FeedbackX / 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 / ChoiceX / 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 / MatchInert 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 / ChoiceX / 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 / ChoiceX / 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 / ChoiceTrue
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 / ChoiceX / 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 / Choice / FeedbackX / 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 / Choice / FeedbackX / 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 / ChoiceX / 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 / ChoiceX / 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 / ChoiceX / 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 / ChoiceTrue
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 / ChoiceX / 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 / ChoiceTrue
X / False
Feedback when correct: Correct
Feedback when incorrect: Incorrect