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1 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) The oxygen dissociation curve shows that as the partial pressure of oxygen is decreased to a very low level, the amount of oxygen bound to hemoglobin: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | increases. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | does not change. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | decreases. |
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2 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Look at your graph. A high transmittance value (‘color') indicates: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | a large amount of oxygen is bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | a small amount of oxygen is bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | no oxygen is bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | nothing with respect to the amount of oxygen bound to hemoglobin. |
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3 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Adding 2,3-diphosphoglycerate (DPG) to blood: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | moves the oxygen dissociation curve to the left. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | moves the oxygen dissociation curve to the right. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | has no effect on the oxygen dissociation curve. |
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4 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Look at the two curves on your graph, about one-third of the way from zero mark on the horizontal axis (a PO2 value around 50 mm Hg). Imagine a vertical line that intersects the curves: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has a lower transmittance value (‘color'). |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has the same transmittance value (‘color') as blood without DPG. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has a higher transmittance value (‘color'). |
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5 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Look at the two curves on your graph, about one-third of the way from zero mark on the horizontal axis (a PO2 value around 50 mm Hg). Imagine a vertical line that intersects the curves. |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has more oxygen bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has the same amount of oxygen bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has less oxygen bound to hemoglobin. |
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6 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) At PO2 levels around 50 mm Hg (approximately the same PO2 value found in the tissues), DPG: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | decreases the amount of bound oxygen; i.e., hemoglobin releases more oxygen to the tissues. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | does not change the amount of bound oxygen; i.e., the amount of oxygen released is constant. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | increases the amount of bound oxygen; i.e., hemoglobin releases less oxygen to the tissues. |
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7 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Look at the two curves on your graph, about two-thirds of the way from zero mark on the horizontal axis (a PO2 value around 100 mm Hg). Imagine a vertical line that intersects the curves. |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has a lower transmittance value (‘color'). |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has the same transmittance value (‘color') as blood without DPG. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | The blood with DPG has a higher transmittance value (‘color'). |
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8 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Look at the two curves on your graph, about two-thirds of the way from zero mark on the horizontal axis (a PO2 value around 100 mm Hg). Imagine a vertical line that intersects the curves: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | the blood with DPG has more oxygen bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | the blood with DPG has the same amount of oxygen bound to hemoglobin. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | the blood with DPG has less oxygen bound to hemoglobin. |
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9 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) At PO2 levels around 100 mm Hg (approximately the same PO2 value found in the lungs), DPG: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | decreases the amount of bound oxygen; i.e., hemoglobin picks up less oxygen. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | does not change the amount of bound oxygen; i.e., the amount of oxygen picked up is constant. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | increases the amount of bound oxygen; i.e., hemoglobin picks up more oxygen. |
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10 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) DPG pushed the oxygen dissociation curve to the right which: |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | promotes loading of oxygen at the lungs and decreases unloading of oxygen at the tissues. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | promotes loading of oxygen at the lungs and promotes unloading of oxygen at the tissues. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | decreases loading of oxygen at the lungs and decreases unloading of oxygen at the tissues. |
| ![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | decreases loading of oxygen at the lungs and promotes unloading of oxygen at the tissues. |
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