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11 Cards in this Set
- Front
- Back
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what are the effects of exercise on respiration?
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1. increase consumption of O2.
2. increase production of CO2. 3. maintained mean arterial pressure of both O2 and CO2. 4. moderate-arterial pH maintain, strenuous-arterial pH lowered. 5. ventilation increase 6. venous PCO2 increase. 7. alveolar deadspace decrease. 8. curve to the right. 9. pulmonary blood flow increase. |
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why ventilation increase during exercise?
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1. adrenaline released.
2. motor cortex stimulate resp centre. 3. movements of limbs stimulate joint receptors that increase ventilation. 4. central control of PCO2 is set to a lower value and held constant. 5. CO2 loads in venous return. |
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how does hypoxemia occur during exercise?
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exercise > pulmonary blood flow increase > decrease time spent by RBC in capillaries by 1/3 from normal. > less oxygenation can happen > hypoxemia.
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condition that cause the O2-Hb curve shift to the right?
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-increase body temp.
-increase CO2 -decrease pH |
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what is acclimatization?
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-change to suit the climate.
-compensatory measures that permit adequate oxygenation of tissues and restoration of normal acid-base balance over period of days. |
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what's the mechanism of hyperventilation?
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-hypoxic stimulation of peripheral chemoreceptors.
- PO2 less than 60 mmHg, > stimulate peripheral chemoreceptors > medullary inspiratory centre > increase ventilation. -resp alkalosis |
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what is polycynthemia?
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-increase synthesis of RBC
-hypoxemia stimulate synthesis of erythropeietin in kidney > lead to RBC synthesis in bone marrow. >increase [Hb] > increase O2 in blood. |
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what happen to acclimatize?
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-hyperventilate
-polycynthemia -2,3-DPG production -pulmonary vasoconstriction -increase capillaries |
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what happen during pulmonary vasoconsriction?
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hypoxia > stimulate pulm vasoconst > increase pulmonary pressure > RV hypertrophy to overcome arterial pressure.
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what are the effects of deep sea diving on respiration?
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-nitrogen narcosis
-decompression |
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what happen in decompression sickness?
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-sudden ascend to the surface
-N2 quickly come out of the solution n form bubbles in the body. (no time to reach the lung n expired) -large bubbles in the body cause pain in joints. -neurological impairment: to senses. |
