Physiology 2130 Lecture Notes - Lecture 10: As Blood Flows, Respiratory Center, Atmospheric Pressure
29 Jan 2015
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Functions of the respiratory system: transport of o2 from the air into the blood, removal of c02 from blood into the air, the control of blood acidity (ph, temperature regulation, forming a line of defense to airborne particles. Branches extensively to for a dense network of capillaries around each alveolus. Structure of capillaries & blood flow characteristic maximize gas exchange: O2 diffuses into blood, co2 diffuses out. O2 blood flows back to left side of (pulmonary vein) Large # of capillaries surround the alveoli in close proximity. Thickness as narrow as 0. 3 microns -where gas exchange takes place bw air & blood. Fibres of elastin & collagen are present in. Contains a very small amount of pleural fluid (10-15ml) Reduces friction bw the 2 pleural membranes during breathing: parietal pleura: lines & sticks to the ribs, viceral pleura: surrounds & sticks to the lungs. Ribs: due to their nature & attached muscle ,tend to spring outward.
