BIOL 221 Study Guide - Final Guide: Partial Pressure, Atelectasis, Hypoventilation
11 Feb 2020
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Document Summary
During inflation the thorax and lungs are stretched. Stretch receptors in the walls are stimulated by this stretch and send afferent impulses to the medullary respiratory centers. The hering-breuer deflation reflex becomes important as the lung is compressed during expiration. This also plays a role in the response to atelectasis. Review your notes then predict whether high or low levels of oxygen, carbon dioxide, and ph will cause breathing to increase or decrease. Ventilation affects external respiration and changes the concentrations of oxygen, carbon dioxide and hydrogen ions in the blood. Under normal ventilation conditions partial pressure of oxygen increases, partial pressure of carbon dioxide decreases and hydrogen ion concentrations decrease. Based on this predict the effect of hyperventilation and hypoventilation on oxygen saturation of the hemoglobin, partial pressure of carbon dioxide and ph. Note that hyperventilation has little effect on oxygen saturation since hemoglobin is almost 100% saturated at normal ventilation conditions.
