Question: Case R 12 Respiratory A Healthy College Student Went To Colorado At The End Of The School Year For A Vacation. While There, He Drove To The Top Of Pike’s Peak. During His First Hour On The Peak, He Walked About But Had To Sit Down To Rest Three Times. The Last Time Was In The Weather Station. He Glanced At The Barometer And Saw It Read 450 Mm Hg. The …

Question: Case R 12 Respiratory A Healthy College Student Went To Colorado At The End Of The School Year For A Vacation. While There, He Drove To The Top Of Pike’s Peak. During His First Hour On The Peak, He Walked About But Had To Sit Down To Rest Three Times. The Last Time Was In The Weather Station. He Glanced At The Barometer And Saw It Read 450 Mm Hg. The …

Case R 12 Respiratory A healthy college student went to Colorado at the end of the school year for a vacation. While there, h

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Case R 12 Respiratory A healthy college student went to Colorado at the end of the school year for a vacation. While there, he drove to the top of Pike’s Peak. During his first hour on the peak, he walked about but had to sit down to rest three times. The last time was in the weather station. He glanced at the barometer and saw it read 450 mm Hg. The barometric pressure at sea level is 760 mm Hg, and the pressure decreases with increasing altitude. Each gas in the atmosphere is present as the same fraction of the whole regardless of altitude. On Pike’s Peak, each gas has a smaller partial pressure than at sea level. Because inspired PO, is lower at altitudes higher than sea level, alveolar and arterial PO, will also be lower. Any change that reduces arterial PO, (especially to values below about 60 mm Hg) stimulates the peripheral chemoreceptors (carotid and aortic bodies). The resulting reflex increases alveolar ventilation, oxygen delivery to the lungs, and the expiration of carbon dioxide. Other disturbances that lower arterial Po, also stimulate ventilation via the peripheral chemoreceptors. Predict that changes increase, decrease, no change) that would have taken place in each of the listed parameters by the time the student entered the weather station compared with the values that he would have had at home (sea level). Further predict the effects of the two other listed conditions in an otherwise normal individual at sea level. Explain each prediction. Alveolar Arterial Arterial Hb Venous Hb Tidal PO, PO, Saturation Saturation Volume Arterial Arterial PCO, pH On Pike’s Peak Moderate exercise Partial tracheal obstruction Hb is hemoglobin