BRS - Respiratory Physiology_1

BRS - Respiratory Physiology_1 - Term Definition What is...

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Term: What is atelectasis? Definition: Alveolar collapse Term: What is hypoxemia? Definition: Decreased arterial PO2 Term: Can VC be measured by spirometry? Definition: Yes Term: Is fibrosis an example of obstructive or restrictive lung disease? Definition: Restricted Term: What is hypoxic vasoconstriction? Definition: Hypoxia causes vasoconstriction (unlike in other organs, where hypoxia causes vasodilation)This directs blood away from poorly ventilated regions
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Term: What factors cause the bronchial smooth muscle to contract? Definition: Parasympathetic stimulationIrritantsSlow-reacting substance of anaphylaxis (asthma) Term: what molecule causes off-loading of O2 from Hb in tissues? Definition: 2,3-diphosphoglycerate Term: What gases exhibit perfusion-limited exchange? Definition: N2OO2 (under normal conditions) Term: What is COPD? Definition: A combination of chronic bronchitis and emphysemaObstructive disease with increased lung compliance, so expiration is impairedDecreased FEV1/FVCAir that should be expired is trapped, leading to increased FRC and a barrel-shaped chest
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Term: What is hypoxia? Definition: Decreased oxygen delivery to the tissues Term: What is the inspiratory capacity? Definition: Tidal volume + IRV Term: Is asthma an example of obstructive or restrictive lung disease? Definition: Obstructive Term: What is the normal value for FEV1/FVC? Definition: 0.8 (80%) Term: what is the earliest time surfactant is produced in the fetus? Definition: 24 weeks
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Term: what is the normal FEV1? Definition: 80% of the FVC Term: what happens to physiologic dead space during exercise? Definition: it decreases Term: What factors cause the oxygen dissociation curve to be shifted to the right (that is, decrease the affinity of hemoglobin for O2)? Definition: Increased PCO2Decreased pHIncreased temperatureIncreased 2,3-BPG concentration Term: What are "blue boaters?" Definition: COPD patients who primarily have bronchitisSevere hypoxemia with cyanosisHypercapnia because alveolar ventilation is not maintainedRight ventricular failure and systemic edema
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Term: How do irritant receptors work? Definition: Found between airway epithelial cellsStimulated by noxious substances Term: How do J receptors work? Definition: Found in the alveolar wallsEngorgement of pulmonary capillaries stimulates them and causes rapid, shallow breathing Term: Which of the standard lung volumes is in the lungs at rest? Definition: The FRC Term: What is respiratory compliance? Definition: Describes the distensibility of the lungs and chest wallIt is inversely related to elasticity (that is, as elasticity increases, compliance decreases)Inversely related to stiffnessCompliance is the change in volume or a given change in pressure. The higher the compliance, the greater the change in volume for that pressure value
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Term: What is the percent saturation of Hb at 100 mmHg (arterial blood)?
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