DAVAO MEDICAL SCHOOL FOUNDATION

Department Of Physiology

Deep Sea Diving PhysiologyNAME:_____________________________________________ RAW SCORE:_____ ____%

Instruction: Select the BEST ANSWER.1. What is the principle of physics called Boyles Law in diving physiology?A. The volume to which a given quantity of gas is compressed is inversely proportional to the pressure.B. The volume to which a given quantity of gas is compressed is directly proportional to the pressure.C. Decreased pressure can collapse the air chambers of the divers body.D. All of the above is correct2. The individual gas/gases to which a diver is exposed when breathing air is/are? A. Nitrogen

B. OxygenC. Carbon dioxide

D. All of the above3. About four fifths of the air is nitrogen. The following are the effects of nitrogen on bodily function. Identify which one is not correct? A. At sea-level pressure, the nitrogen has no significant effect.

B. At 150 to 200 feet, the diver becomes drowsy.C. When the diver remains beneath the sea for an hour or more, the depth at which the first symptoms of mild narcosis appear is about 200 feet.D. At 200 to 250 feet, the diver becomes too clumsy to perform the work required.4. Above a critical alveolar PO2, the hemoglobin-oxygen buffering mechanism fails and the tissue PO2 then rise to thousands of millimetres of mercury. Which one would be the effect of these? A. The amounts of oxidizing free radicals have no more effects on the cells.B. It oxidizes the monosaturated fatty acids that are essential components of cell membranes.C. It oxidizes some of the cellular enzymes that helps repair the metabolic systems.D. The nervous systems are susceptible to damage because of their high lipid content.5. Chronic oxygen poisoning causes pulmonary disability. After only about 12 hours of 1 atmosphere oxygen exposure, which one is not true?

A. Pulmonary consolidation

C. AtelectasisB. Pulmonary edema

D. Lung passageway congestion6. Decompression Sickness of the Diver is caused by the following, except one?A. Blood flowing through pulmonary capillaries becomes saturated with nitrogen.

B. Nitrogen is carried to all the tissues of the body to raise their tissue PN2.C. Nitrogen is not metabolized by the body, it remains dissolved in all body tissues.D. Nitrogen cannot be removed by the reverse respiratory process.7. In very deep dives, helium is usually used in the gas mixture instead of nitrogen because of the following reasons. Identify which is false.

A. It has only about one fifth the narcotic effect of nitrogen.B. Its volume that does not dissolve diffuses out of the tissues during decompression slowly than nitrogen.C. Only about one half as much volume of helium dissolves in the body tissues as nitrogen.D. The low density of helium keeps the airway resistance for breathing at a minimum.TRUE OR FALSE8. A column of sea water 33 feet deep exerts the same pressure at its bottom as all the atmosphere above the earth.A. True

B. False9. At 33 feet beneath the sea, where the pressure is 1 ATA, the volume has been compressed to only half liter and at 8 ATA to one eight liter.A. True

B. False10. Nitrogen narcosis has characteristics similar to those of alcohol intoxication and for this reason it has frequently been called raptures of the depth.

A. True

B. False

11. When the PO2 in the blood rises far above 100mmhg, the amount of oxygen dissolved in the water of the blood increases markedly.

A. True

B. False

12. In acute oxygen toxicity, exercise greatly decreases a divers susceptibility to oxygen toxicity.

A. True

B. False13. The nitrogen dissolved in the water of the body comes to almost complete equilibrium in less than 1 hour, but the fat tissue, requiring five times as much transport of nitrogen and having a relatively poor blood supply, reaches equilibrium only after several hours.

A. True

B. False

14. In most people with DCS, the signs and symptoms are pain in the joints and muscles of the legs or arms affecting 15-20% of persons who developed DCS.A. True

B. False15. The type of SCUBA apparatus used in more than 99% of all sports and commercial diving is the open circuit demand system.

A. True

B. False

16. Hyperbaric chamber treatment does not limit to treatment of diving related indications but also to some selected medical conditions. Examples: gas gangrene.

A. True

B. False

17. In acute oxygen toxicity, the divers/patients lungs is affected.

A. True

B. False18. In chronic oxygen toxicity, the divers/patients brain is affected.A. True

B. False19. HBO is utilizing the high partial pressure of Oxygen to be dissolved in the plasma of the blood and will be utilized by the hypoxic tissues involvedA. True

B. False

20. Cigarette smoking before diving could increase the partial pressure of Carbon dioxide and can potentially cause poisoning and so it is discourage for SCUBA enthusiast

A. True

B. False