Ventilation control in humans
- Created by: MCahoon
- Created on: 06-09-18 12:32
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- Control of ventilation in humans
- Stimulated by impulses in the fore-brain or carbon dioxide conc. in blood. All is controled by the breathing centre of the hindbrain
- At low pressures, oxygen loading tension is low
- Take deeper breaths in to force more CO2 out of the body and lower blood CO2 conc.
- fatigue is caused as the breathing centre is no longer stimulated
- After time humans cvan adapt to these conditiions-> excrete more alkali urine
- Take deeper breaths in to force more CO2 out of the body and lower blood CO2 conc.
- At low pressures, oxygen loading tension is low
- Emphesema- damages lung tissue
- Elastin (connective tissue) becomes permanently stretched so the air cannot force out all the air. Little to no gas exchange can occur at these damaged sites.
- Smoke may inhibit the PI so the elastase breaks down the elastin
- The smoke in lungs attract phagocytes that produces elastase
- Asthma
- Treatment: Bronchio-dilators to open up the airways. Antihistamines to counteract inflammation.
- Sensitation: The substance is engulfed by phygocyte which produces antibodies to the allergen that bind to a mast cell
- Activation: Re-exposure, Same allergen binds to the antibodies on the mast cell causing release of chemicals
- Histamines cause inflammation of the lungs. Others cause spasm of the smooth muscle lining the brochial passages
- Activation: Re-exposure, Same allergen binds to the antibodies on the mast cell causing release of chemicals
- Triggers: Cold air, exercise, anxiety
- Stimulated by impulses in the fore-brain or carbon dioxide conc. in blood. All is controled by the breathing centre of the hindbrain
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