Notes in 7 Respiratory Physiology in High Altitudes and Deep Sea Diving

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Published	11/18/2024	Altitude is directly proportional to the barometric pressure. Atmospheric pressure is inversely proportional to the partial pressure of O2. Both …
Published	11/18/2024	The percentage of individual gasses in air does change with altitude, but atmospheric pressure does not. Both statements are correct. Both s…
Published	11/18/2024	A decrease in barometric pressure is the basic cause of all hypoxia. The  partial pressure of O2 decreases proportionately with decreasing barome…
Published	11/18/2024	In the alveolar air equation. PAO2 is equal to the sum of PIO2 and the quotient of PACO2 plus F (correctional ~2 mmHg) divided by the respiratory exch…
Published	11/18/2024	Decreasing the respiratory exchange ratio in the alveolar air equation: Does not do anything. Increases alveolar PO2.Decreases alveolar PO2.…
Published	11/18/2024	Which of the following is a true statement about the impact of altitude on gas exchange?Water vapor pressure increases at high altitude.CO2 concentrat…
Published	11/18/2024	The higher the altitude, the higher the barometric pressure, the lower the oxygen in the air. TrueFalse
Published	11/18/2024	Which of the following is true about oxygen saturation and altitude?Arterial oxygen saturation remains at 90% up to 47,000 feet.Breathing air at 23,00…
Published	11/18/2024	Which of the following statements about Acute Mountain Sickness (AMS) are true?AMS can occur as low as 1500 meters above sea level.AMS can occur as lo…
Published	11/18/2024	Which of the following is not a symptom of Acute Mountain Sickness (AMS)?HeadacheFatigueHallucinationsDifficulty sleeping
Published	11/18/2024	Which of the following is not a symptom of stage 1 Acute Mountain Sickness (AMS)?HeadacheFatigueAtaxiaDizziness
Published	11/18/2024	Which of the following is seen in stage 3 Acute Mountain Sickness (AMS)?InsomniaFatigueHigh Altitude Cerebral Edema (HACE)Headach
Published	11/18/2024	Which of the following statements is correct about High Altitude Cerebral Edema (HACE)?HACE results from vasoconstriction of cerebral blood vessels.HA…
Published	11/18/2024	According to the Lake Louise Consensus, which of the following scenarios is not indicative of HACE?A person with AMS develops ataxia.A person without …
Published	11/18/2024	Which of the following is not a characteristic of High Altitude Pulmonary Edema (HAPE)?Increased pulmonary vascular resistanceDecreased pulmonary capi…
Published	11/18/2024	A man is planning to leave Miami (at sea level) and travel to Colorado to climb Mount Wilson (14,500 feet, barometric pressure = 450 mm Hg). Before hi…
Published	11/18/2024	Which of the following is not a physiological response to hypoxia?Increased alveolar ventilationDecreased renal bicarbonate excretionStimulation of pe…
Published	11/18/2024	Which of the following is a mechanism by which the body compensates for hypoxia at high altitude?Decreased heart rateDecreased respiratory rateIncreas…
Published	11/18/2024	Which of the following is not a consequence of increased alveolar ventilation?Mild shortness of breathDecreased respiratory rateChanges in respiratory…
Published	11/18/2024	Which of the following is not true regarding polycythemia at high altitudes and its excessive form, chronic mountain sickness?Polycythemia helps incre…
Published	11/18/2024	Which of the following statements accurately describes vascularization in response to high-altitude hypoxia?A. Increased vascularization at high altit…
Published	11/18/2024	Which of the following steps does not describe the progression of Chronic Mountain Sickness (Monge’s Disease)?Increased red blood cell mass leading to…
Published	11/18/2024	Which of the following statements accurately describe physiological changes and challenges during deep-sea diving?A. Pressure increases are directly p…
Published	11/18/2024	A diver descends to a depth of 30 meters, where the ambient pressure is 4 atm. If the diver's tidal volume at sea level is 600 mL, what will the tidal…
Published	11/18/2024	A diver descends to a depth of 50 meters, where the ambient pressure is approximately 6 atm. If the diver’s lung volume at sea level (1 atm) is 4.5 li…
Published	11/18/2024	Which of the following statements about nitrogen narcosis is accurate?A. Nitrogen narcosis symptoms are similar to those of alcohol intoxication, such…
Published	11/18/2024	Which of the following statements about dysbarism is correct?Dysbarism is a medical condition resulting from changes in ambient pressure, such as deco…
Published	11/18/2024	Which of the following conditions are associated with symptoms such as deafness, impaired vision, and paralysis due to obstruction of blood vessels?De…
Published	11/18/2024	What happens when oxygen pressure (PO2) increases above the critical level, exceeding the Hgb-O2 buffer mechanism?Tissue PO2 remains within a safe ran…
Published	11/18/2024	Which of the following is a symptom of acute oxygen poisoning?Fatigue and weaknessConvulsions without warning, nausea, and muscle twitchingIncreased h…
Published	11/18/2024	Which of the following is a cause of pulmonary disability due to chronic oxygen poisoning?Heart failureLung passageway congestion and pulmonary edemaD…
Published	11/18/2024	What is the primary cause of barotrauma during diving?Rapid change in air temperatureSlow descent and ascentRapid changes in air or water pressureLack…
Published	11/18/2024	According to Boyle's Law, how does the volume of a gas change with pressure?Volume increases as pressure decreasesVolume remains constant regardless o…
Published	11/18/2024	What is the limitation of time underwater at greater depths, such as 200 ft.?Increased oxygen availability at greater depthsReduced need for air tanks…
Published	11/18/2024	A scuba diver at a depth of 90 feet would be expected toHave a smaller tidal volume than normalHave a normal arterial PCO2Have a decreased hemoglobin …
Published	11/18/2024	During acclimation to altitude: The sensitivity of carotid bodies to hypoxia increasesThe sensitivity of central chemoreceptors to hypoxia increa…
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