HTHSCI 1CC6 Lecture Notes - Lecture 9: Intrapleural Pressure, Pulmonary Compliance, Lung Volumes
25 Oct 2018
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Diffusion of gases: particles move from an area of high concentration to one of low concentration, rate of exchange depends on: partial pressure gradients of the gases for passive diffusion, diffusion distance & surface area. V/q ratio: (the ventilation-perfusion ratio: ratio between the amount of air getting to the alveoli & the amount of blood being sent to the lungs. Factors: gravity, intrapleural pressure & compliance: at dependent part of the lung, intrapleural pressure would be higher (or less negative) due to the weight of the lung tissues. Combination of: higher intrapleural pressure, and 2. Distributing prohibited | downloaded by arsen terzian (arsen98@gmail. com) lomoar cpsd|2151316. Alveoli less expanded at the base of lung. Compliance at base is more optimal and is higher than apex = base ventilates better than apex. Lung volume & recoil: very low lung volume. At very low lung volume (lower than closing capacity), e. g. residual volume.
