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7 Cards in this Set
- Front
- Back
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Hemoglobin |
Iron-protein pigment in the red blood cell, increases amount of O2 carries in whole blood about 65 times that carried in physical solution in the plasma |
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Plasma PO2 |
Small amount of O2 in plasma exerts molecular movement and establishes the PO2 in the blood. Plasma PO2 determines the loading of hemoglobin at the lungs (oxygenation) and its unloading at the tissues (deoxygenation) |
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Blood's oxygen-transport capacity |
Varies slightly with normal variations in hemoglobin conc. Iron deficiency, anemia, lowers hemoglobin conc, thus decreasing the blood's oxygen-carrying capacity. Lowered hemoglobin conc impairs aerobic exercise performance |
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Oxyhemoglobin dissociation curve |
Shape indicates hemoglobin saturation. Changes little until PO2 declines below 60mmHg. Amount of O2 bound to hemoglobin falls sharply as O2 moves from capillary blood to the tissues when metabolic demands increase |
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Arterial Blood at Rest |
Releases about 25% of it's O2 content to the tissues at rest; the remaining returns "unused" to the heart in venous blood Difference between arterial and venous blood indicates automatic reserve of O2 for rapid use if metabolism suddenly increases |
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Bohr Effect |
Reflects alterations in the molecular structure of hemoglobin from increased acidity, temperature, CO2 conc that reduce its effectiveness to hold O2. Exercise accentuates these factors to further facilitate O2's release to the tissues |
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Myoglobin |
Iron-protein pigment In skeletal and cardiac muscle Provides extra O2 store to release O2 at low PO2. Intense exercise: myoglobin facilitates O2 transfer to mitochondria when intracellular PO2 in active skeletal muslce decreases dramatically |
