PHYS20008 Lecture Notes - Lecture 16: Circulatory System, Surface Tension, Atmospheric Pressure
8 May 2019
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Document Summary
Alveoli are surrounded by capillaries and elastic fibres. Alveoli need a large sa and thin layers to allow for gas exchange. Type 1 alveoli for gas exchange. Type 2 alveoli produce surfactant to reduce surface tension. Right atrium receives used up deoxygenated blood from the body. Right ventricle pumps deoxygenated blood to the lungs to be oxygenated. Left ventricle pumps oxygenated blood to the rest of the body. Systemic circulation = blood from lv to body to ra. Pulmonary circulation = blood from rv to lungs to la. Pulmonary circuit requires much less pressure as it is a smaller pathway. Ventilation-perfusion matching is based on the idea that not all alveoli are equal. Pulmonary arterioles delivering the blood running past an alveolus with lower gas levels will constrict in order to stop sending blood to the underused alveoli and focus more on the alveoli doing their job.
