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Bio Additional Final Exam Study Questions

Bio Additional Final Exam Study Questions - 2 in the blood...

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ADDITIONAL STUDY QUESTIONS FOR FINAL (version 2, 12/12/09) 1. How does one calculate the partial pressure of a gas in a mixture of gasses? What is the relationship between partial pressure and the amount of gas dissolved in an aqueous solution? 1What factors other than partial pressure affect the amount of dissolved gas that a solution can hold? 2. What is a major problem that air-breathing organisms face compared with aquatic organisms? How do terrestrial organisms such as insects and humans minimize water loss by evaporation across gas exchange surfaces? What is a major disadvantage of being a water breather? Which contains more O 2 , a liter of water or a liter of air? What does this difference mean in terms of the amount of energy that must be expended to obtain O 2 ? 3. What is Fick’s law, and how is it relevant to the needs of living organisms? 4 . How much oxygen is carried in the plasma as a dissolved gas? How is the remainder carried? What percentage of the Hb binding sites are saturated with O
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Unformatted text preview: 2 in the blood leaving the lungs where P O2 is 100 mm Hg? 5. Ignoring the Bohr shift (the effect of pH on the Hb binding curve), what percentage of the Hb binding sites are saturated in exercising tissues where P O2 is 30 mm Hg? How does the fact that there is more CO 2 released by exercising tissue affect the percentage of Hb saturation in exercising tissue vs. resting tissue? [Explain in terms of the plasma pH in exercising vs. resting tissue.] 6. What is the difference between open and closed circulatory systems? What advantages do closed systems have? In open systems what helps move haemolymph to and from the heart? 7. How is CO 2 transported in the blood? What enzymatically catalized reaction is occurs in red blood cells that facilitates the transport of CO 2 in blood plasma? What role does Hb play in the transport of CO 2 ? 8. How many “circuits” are there in the human circulatory system? What are they? What is the function of each circuit?...
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