BPK 142 Lecture Notes - Lecture 7: Alveolar Pressure, Elastic Fiber, Bronchiole
3 Feb 2018
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Document Summary
Pulmonary structure and function: anatomy of the respiratory system. The respiratory system consists of: nose, pharynx, larynx, trachea, bonchi (primary, secondary, tertiary), lungs. With branching, supportive cartilage is gradually replaced by smooth muscle. Contraction and relaxation of this smooth muscle constricts or dilates the bronchioles (major e ects on airway resistance) The conducting airways lead inspired air to the alveoli. Volume of conducting airways = anatomic dead space (vd), (around 150 ml) Alveoli small, thin-walled sacs that have capillary beds in their walls; site of gas molecule (o2 & Co2) exchange between air and blood (there are millions of alveoli) Respiratory membrane separates the air molecules in the alveoli from the blood in the capillaries. Lungs contain conducting airways, alveoli, blood vessels, elastic tissue. Molecules move from areas of high pressure to low pressure. Boyle"s law the pressure of a gas is inversely proportional to its volume.
