Diseases of the Respiratory System

Diseases of the Respiratory System - partial pressures. The...

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Diseases of the Respiratory System The condition of the airways and the pressure difference between the lungs and atmosphere are important factors in the flow of air in and out of lungs. Many diseases affect the condition of the airways. Asthma narrows the airways by causing an allergy-induced spasms of surrounding muscles or by clogging the airways withmucus . Bronchitis is an inflammatory response that reduces airflow and is caused by long-term exposure to irritants such as cigarette smoke, air pollutants, or allergens . Cystic fibrosis is a genetic defect that causes excessive mucus production that clogs the airways. The Alveoli and Gas Exchange Diffusion is the movement of materials from a higher to a lower concentration. The differences between oxygen and carbon dioxide concentrations are measured by
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Unformatted text preview: partial pressures. The greater the difference in partial pressure the greater the rate of diffusion. Respiratory pigments increase the oxygen-carrying capacity of the blood. Humans have the red-colored pigment hemoglobin as their respiratory pigment. Hemoglobin increases the oxygen-carrying capacity of the blood between 65 and 70 times. Each red blood cell has about 250 million hemoglobin molecules, and each milliliter of blood contains 1.25 X 10 15 hemoglobin molecules. Oxygen concentration in cells is low (when leaving the lungs blood is 97% saturated with oxygen), so oxygen diffuses from the blood to the cells when it reaches the capillaries. Effectiveness of various...
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Diseases of the Respiratory System - partial pressures. The...

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