HW 3 Key

# HW 3 Key - Name KEY EBME 202 Homework#3 Reference Rhoades...

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Name: KEY EBME 202 Homework #3 Reference: Rhoades and Pflanzer 4 th edition, page 666 T21-2 Warning: When we ask for SHORT sentences we mean, in fact, 1 sentence. Items identified in this way can be described with one well thought out sentence. We will not give credit for long, wandering explanations except where we explicitly ask for more than 1 sentence. The situation: A person with a total lung capacity (TLC) of 5L and a vital capacity (VC) of 5L has been breathing normally for a long time. He takes 10 VC breaths in quick succession. 1. He then starts holding his breath. (2pts total: 1pts each) a. Is a TLC of 5L reasonable for an adult male? (Yes, 4-6 L is average) b. Is a VC of 5L reasonable for an adult male? (No, VC should not equal TLC) 2. The respiratory quotient (RQ) for this person is 0.80. RQ is defined as CO 2 production (mL/ min)/O 2 consumption(mL/min). We know that the O 2 consumption for this person is 250mL/min. At the end of 10 VC breaths, we can make a few assumptions: Alveolar air has the same composition as ambient air (including water vapor). Constant O 2 consumption, leaving the alveoli at a constant rate. CO 2 is pumped into the alveoli at a constant rate. a. At the beginning of the breath holding period, what are the % compositions of the following components of air in the alveoli of the 5L of the TLC? (1 pt) O 2 % = 21.12 CO 2 % = 0.04 N 2 % = 79 b. At the beginning of the breath holding period, what are the partial pressures of the following gases in the alveoli? (1 pt) ppO 2 = 159.1 ppCO 2 = 0.3 ppN 2 = 600.6

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c. Is it reasonable that CO 2 will be pumped into the alveoli at a constant rate as previously assumed from above? Explain in ONE short sentence. (3 pt) (yes/no) Simple explanation: No. The key thing is to note that O2 and CO2 are interdependent and as O2 gradient changes in the alveoli, the rate of diffusion is changed accordingly. d. After 10 VC breaths, it is likely that alveolar air is almost the same as ambient air? Explain in ONE short sentence. (3 pt) (yes/no) Simple explanation: Yes. The person has no RV so after 10 quick VC breathes, he has fully exchanged all the gas in his lungs. No gas exchange has occurred yet (t=0). 3.
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HW 3 Key - Name KEY EBME 202 Homework#3 Reference Rhoades...

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