Quiz 01 - Q uestion 1 of 15 Regarding the pulmonary acinus:...

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Question 1 of 15 Regarding the pulmonary acinus: A. Each acinus is supplied by a different lobar bronchus. B. All of the pulmonary oxygen uptake occurs in the acini. C. The acini comprise 75% of the lung volume at FRC. D. The percentage increase in volume of the acini during inspiration is less than that of the whole lung. E. The acinus is empty of alveolar gas in the upright human lung at residual volume. 1 out of 1 ANSWER: B The acinus is a functional unit of gas exchange distal to the terminal bronchioles, which are the last bronchiole branch of the conducting airways (dead space). Question 2 of 15 The pulmonary arteries: A. Have more smooth muscle and connective tissue than systemic arteries. B. Follow the bronchial tree in their branching pattern. C. Deliver oxygenated blood to the lungs for metabolic needs. D. Have similar intravascular pressures to systemic arteries. E. Receive less total blood flow than the aorta. 0 out of 1 ANSWER: B Pulmonary arteries are typically found next to the bronchi at most levels of branching, while only the large pulmonary veins travel next to large bronchi. Smaller pulmonary veins collect end-capillary blood in the peripheral lung tissue away from major bronchi. Question 3 of 15 The airways of the lung: A. Have over 20 orders of branching, which greatly increases the total resistance to airflow across the total cross-sectional area of small air ways. B. Have ciliated epithelium and glands that secrete mucus at every level of branching. C. Are involved in convective transport of airflow only down to the segmental (tertiary) bronchi while diffusion takes over as the main mechanism of gas transport in more distal bronchi. D. Are lined by thick, columnar epithelial cells in the conducting airways but thin, squamous epithelial cells at the alveolar level. E. Are supported by cartilage only at the level of the trachea and two primary bronchi. 1 out of 1 ANSWER: D Thick, columnar epithelial cells in the larger bronchi may be ciliated while squamous Type I alveolar epithelial cells have thin processes spreading away from their nucleus to form the outer cellular layer of the extremely thin blood- gas barrier in the alveoli. Question
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This note was uploaded on 09/14/2011 for the course PHARM ps taught by Professor Staff during the Spring '11 term at UCSD.

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Quiz 01 - Q uestion 1 of 15 Regarding the pulmonary acinus:...

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