After a week of scuba diving in the Bahamas, Mary Ann boards an airplane. During

Question

After a week of scuba diving in the Bahamas, Mary Ann boards an airplane. During her flight home, she develops aching joints, nausea, and dyspnea, which resolve upon landing. During the flight, the cabin pressure was equivalent to an altitude of 8000 feet, which amounts to 564 mmHg air pressure. Define dyspnea. Type answer as 2 words using lowercase letters. (1 point) What is the percentage of oxygen in the atmosphere? Type answer using numbers, followed by %. Be sure to round your answer to the nearest whole number. (1 point) What is the percentage of oxygen in the airplane cabin? Type answer using numbers, followed by %. Be sure to round your answer to the nearest whole number. (1 point) What is the partial pressure of oxygen in the airplane cabin? Type answer using numbers, followed by mmHg. Be sure to round your answer to the nearest whole number. (1 point) What is the partial pressure of fully oxygenated, arterial blood? Type answer using numbers, followed by mmHg. Be sure to round your answer to the nearest whole number. (1 point) Comparing the normal partial pressure of oxygen in the air at sea level, the partial pressure of fully oxygenated, arterial blood, and the partial pressure of oxygen in the airplane cabin calculated for question 3, could the blood become fully oxygenated in the airplane cabin- yes or no? Type answer as 1 word from the 2 choices given, using lowercase letters. (1 point) Explain your answer to question 6. (2 points) Would this cabin pressure be- less than, the same as, or more than- the pressure she experienced during scuba diving? Type answer as 1 of the 3 choices given, using lowercase letters. (2 points) 1. 2. 3. 4. 5. 6. 7. 8.

Explanation / Answer

1. Define Dyspnea

Dyspnea or shortness of breath is a condition when a person feels difficulty to breath.

In 2 words – Shortness of breath.

2. What is the percentage of oxygen in the atmosphere?

The percentage of the oxygen in atmosphere is about 21%. (20.8%).

3. What is the percentage of oxygen in the airplane cabin?

The air pressure at sea-level is 760 mmHg which equivalents to 21 % of oxygen

Hence, at cabin pressure 564 mmHg oxygen content will be, (564 x 21) /760 = 15.6% = ~ 16%

4. What is the partial pressure of oxygen in the airplane cabin?

The air pressure at sea level is 760 mmHg and the concentration of oxygen is 21%

Hence, the partial pressure of oxygen is at sea level – 760 x (21/100) = 160 mmHg.

Now, for cabin, the air pressure is 564 mmHg and the oxygen concentration is 16%

Hence the partial pressure of oxygen inside cabin is 564 x (16/100) = 90 mmHg.

5. What is the partial pressure of fully oxygenated arterial blood?

The partial pressure of fully oxygenated arterial blood is 100 mmHg.

6. Comparing the normal partial pressure of oxygen in the air at sea level, the partial pressure of fully oxygenated, arterial blood, and the partial pressure of oxygen in the airplane cabin calculated for question 3, could the blood become fully oxygenated in the airplane cabin- yes or no?

no

7. Explain your answer to question 6.

At sea level the air pressure is 760 mmHg and at the cabin it is 564 mmHg which is less. So less air pressure will prevent fully oxygenation of blood. As the partial pressure of oxygen in blood will remain same at the cabin as it is at sea level, but due to less partial air pressure of oxygen at cabin the diffusion process for gas exchange will be less effective.

8. Would this cabin pressure be less than, the same as or more than the pressure she experience during scuba diving?

Cabin pressure is less than the pressure she experienced during scuba diving. Even the pressure at sea level is less than the pressure she experienced during scuba diving. As every 10 meters under the sea the pressure increases 760 mmHg.

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