Pulmonary Ventilation

by Zafar, Aiesha


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Lecture´s Description

In this video lecture, educator explains the process of pulmonary ventilation also known as breathing and mechanics behind it. Different muscles are involved in process of breathing. During normal breathing certain variation occurs during inhalation and exhalation.

Mechanism of breathing involves inspiration and expiration. Three types of pressures cause movement of air in and out of the lungs. The fluid b/w the lung pleura and the chest wall pleura is called pleural fluid. The pressure of the air inside the lung alveoli is called alveolar pressure. Alveolar pressure changes during pulmonary ventilation. The difference between the alveolar pressure and the pleural pressure is called trans-pulmonary pressure.

The extent to which a lung will expand for unit increase in the trans-pulmonary pressure is called compliance of lungs. Educator defined terms specific compliance, surface tension, effect of surface tension on alveoli size, surfactant and its functions.

Work is required to move the lungs and he chest wall. There are four types of pulmonary volumes and capacities with different normal values. A spirometer is used to determine the vital capacity of the lungs.

Total amount of new air moved into the respiratory passages each minute is called minute respiratory volume is called minute respiratory volume. The amount of air which reaches the alveoli containing and takes part in gaseous exchange is called alveolar ventilation. The anatomical dead space in a person is roughly the weight of a person in pounds. Physiological dead space is the total amount of the inspired air that does not take part in the gaseous exchange.

During exercise, the values of ventilation perfusion ratio across the lung becomes more homogenous. Respiratory passageways have different functions.

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