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Respiratory Physiology The inspiratory muscle include the? a. Diaphragm and internal intercostal muscles b. Diaphragm and external intercostal muscles c. Diaphragm and abdominal muscles d. Internal and external intercostal muscles e. None of the above Which of the following statements concerning alveoli is incorrect? a. Alveoli are the site of gas exchange in the lungs b. Interdependence of alveoli refers to air flow between adjacent alveoli through the pores of Kohn c. Alveolar Type 2 cells secrete pulmonary surfactant d. Alveoli are very thin and are surrounded by a network of capillaries so that air and blood are separated by a very thin barrier e. The alveoli are thin-­‐walled, inflatable, grape-­‐like sacs at the end of the bronchioles Which condition would result in the lowest alveolar ventilation rate? a. Quiet breathing b. A normal respiratory rate and normal tidal volume c. A low respiratory rate and high tidal volume d. A high respiratory rate and very low tidal volume e. A low respiratory rate and very low tidal volume When the level of blood flow is not ideally matched with the amount of airflow in a localized area of the lung tissue? a. Antiregulatory mechanisms are invoked b. The autonomic nervous system couples the events more ideally c. If airflow is low and blood flow is too high, arteriolar vasoconstriction occurs d. Both a and c Alveolar PO2 is higher following inspiration than following expiration? a. True b. False The partial pressure of a gas in blood depends on the amount that is physically dissolved and not on the total content of the gas present in the blood? a. True b. False The atmospheric PO2 is approximately? a. 22 mmHg b. 120 mmHg c. 160 mmHg d. 220 mmHg e. The same as for nitrogen Select the incorrect statement about hemoglobin? a. It combines with oxygen at the lungs b. It contains iron c. It forms an irreversible association with oxygen d. It is located inside the red blood cell e. Its globin portion is a polypeptide