BIOM20002 Lecture Notes - Lecture 53: Tidal Volume, Pulmonary Compliance, Viscosity
Document Summary
Csa increases as we move through the system. Walls contain smooth muscle innervated by autonomic nervous system (pns/sns). Increases with an increase in length of airway, increase in air viscosity, decrease in airway diameter. Can really only control diameter - main determinant of airway resistance. More co2 means less ventilation so bronchioles dilate to let in more air. Airway resistance: (cid:1373) airway diameter (cid:1372) (cid:1371) airway resistance (cid:1372) (cid:1371) work of breathing. Lung compliance: ability of lung to stretch. (cid:1373) lung compliance (cid:1372) harder to stretch lungs (cid:1372) (cid:1371) Work of breathing. (cid:1373) in diseases such as pulmonary fibrosis when inelastic scar tissue is air out of lungs when you relax. (cid:1373) in diseases such as emphysema when elastin fibres in lung formed. Lung elastance (elasticity): ability of lung to spring back after being stretched. If lung compliance increases then lung elastance decreases. Attraction of water to each other causes an inward pressure which makes it difficult to expand alveoli.
