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Anatomy

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Gas Transport

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Module: Respiratory System Activity: Animations Title: Gas Transport

Introduction

1. Summarize blood’s role with regard to transporting oxygen and carbon dioxide.

Oxygen Transport

2. Contrast the two ways oxygen is transported in blood.

Dissolved in Blood Plasma

Bonded to Hemoglobin

3. Describe the important role of the heme groups within each hemoglobin molecule.

4. Define each of the following:

deoxyhemoglobin

oxyhemoglobin

5. What is the oxygen association reaction that occurs in the lungs?

6. What is the oxygen dissociation reaction that occurs at the tissue cells?

Factors That Affect Hemoglobin’s Saturation With Oxygen

7. Name the factors that affect hemoglobin’s saturation with oxygen. Once completely saturated, the molecule is called oxyhemoglobin.

Oxygen-Hemoglobin Dissociation Curve

8. PO2 is a primary factor influencing the degree of hemoglobin saturation. Explain how PO2 in the lungs and tissue cells determines whether oxygen binding or dissociation occurs with hemoglobin.

Hemoglobin’s Affinity for Oxygen

9. a. Describe the Bohr Effect.

b. In contrast to the Bohr Effect, how does elevated pH affect hemoglobin’s oxygen affinity?

10. a. Actively metabolizing cells aerobically use oxygen and produce carbon dioxide. Describe how increasing levels of blood carbon dioxide affect hemoglobin’s oxygen affinity? Where (in the body) does this occur?

b. Explain CO2’s affect on oxygen loading in the alveolar spaces.

11. Describe how body temperature affects O2 association with hemoglobin.

12. Explain the affect of BPG on O2 association with hemoglobin.

Carbon Dioxide Transport

13. Name the three ways CO2 can be transported by the blood and the percentage for each mechanism.

14. Explain carbaminohemoglobin formation and function.

15. a. Explain bicarbonate ion formation and how it is used to transport carbon dioxide.

b. Define the chloride shift and explain why it occurs.

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