Transthoracic compliance formula:-
Correct Answer: C = V/AIv p - atmospheric pressure
Description: Various pressures in thoracic cage. 1. Intra pleural pressure - - Intra pleural pressure is the pressure of the fluid in the thin space b/w the lung pleura & the chest wall pleura - It's a slight negative pressure. - Normal pleural pressure at the beginning of inspiration is about - -5 cm H2O (at rest) - At rest - - 5cm H2O - At normal inspiration - - 7.5 cm H2O 2. Intra alveolar pressure - Pressure in alveolus - This is equal to atmospheric pressure. - It is considered to be zero at rest. Transpulmonary pressure - difference b/w alveolar & pleural pressure. Transthoracic pressure - Transthoracic compliance - Alveolar pressure - Atmospheric pressure
Category:
Physiology
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