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Restricted Airflow 2. What happens to air flow as the tube radius decreases? How does this...

Restricted Airflow

2. What happens to air flow as the tube radius decreases? How does this affect lung volume and

respiratory rate? Give 2 examples of diseases that would cause a change in tube radius.

Science   Anatomy-And-Physiology   
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Answer #1

When the tube radius decreases it causes obstruction is air flow and decreases the rate of flow of air.It reduces the amount of air inhaled in each breath and the oxygen that reaches the pulmonary arteries.It affect the FEV1 and FVC of lungs ,total lung capacity remain unaffected,.due to narrowing of air passage the resistance to air flow is increased thus the FEV1 is decreased and FVC is also decreased.Respiratory rate will increase due to insufficient elimination of CO2 from the body .

Examples of the Dieseases which decreases the radius of tube are
Obstructive lung diseases :(1) Bronchial Asthma

(2) COPD

(3) Bronchiectasis

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