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17 Cards in this Set
- Front
- Back
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The pathway of Oxygen from air into circulatory system |
nasal cavity trachea bronchi bronchioles alveoli capillaries Pulmomary vein |
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Pulmonary Ventilation |
Moving of air in & out of the lungs (breathing) |
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External respiration |
O2 and CO2 exchange between lungs and the blood |
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What is transported in the circulatory system? |
Oxygen and carbon dioxide |
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Internal respiration |
O2 and CO2 exchange between systemic blood vessels and tissue |
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Partial pressure |
It is Pressure that each of the gases in a mixture exerts. It Represents the concentration of the gas in the blood |
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Importance of partial pressure |
It drives the gases from a low concentrated area to a high concentrated area |
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How is oxygen transported in the blood |
Attached to haemoglobin and dissolved in the plasma |
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How is Carbon dioxide transported in the blood |
little bit is dissolved in plasma (10%) Some attached to haemoglobin (20%) Most of it turns to bicarbonate (70%) |
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Where alveolar O2 is HIGH ________ |
arterioles dilate |
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Where alveolar O2 is LOW __________ |
arterioles contrict |
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Where alveolar CO2 is HIGH _______ |
Bronchioles dilate |
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Where alveolar CO2 is LOW __________ |
Bronchioles constrict |
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MISMATCH: VENTILATION & LUNG PERFUSION When there is HIGH blood flow to lungs and LOW ventilation ________________ |
Poor gas exchange. Vessels will constrict to decrease blood blow to lungs and maximise gas exchange |
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MISMATCH: VENTILATION & LUNG PERFUSION When there is LOW blood flow to lungs and HIGH ventilation ______________ |
Poor gas exchange. Vessels will dilate to allow more blood flow and maximise gas exchange |
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Chemoreceptors |
- Sensitive to changes in carbon dioxide - stimulates rate of respiration - They synapse with therespiratory regulatory centers, increasing the depth and rate of breathing |
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Control of respiration |
(From Respiratory centre in pons & medulla) LUNGS: - Stretch receptors - Irritant receptors BLOOD: - Peripheral Chemoreceptors |
