NUR 242 EXAM 3 LATEST ACTUAL EXAM 180 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES ALREADY GRADED A+ GALEN COLLEGE OF NURSING
What is ventilation? - ANSWER>>the movement of air into and out of the lungs
What is perfusion? - ANSWER>>the circulation of blood through the lungs
What are central chemoreceptors responsive to? - ANSWER>>increased H+ in the
brain ECF;
increased PaCO2;
"hypercarbic drive"
What are peripheral chemoreceptors responsive to? - ANSWER>>decreased pH;
increased PaCO2;
decreased PaO2;
"hypoxic drive"
What are elastic forces? - ANSWER>>lungs recoil due to elastin, collagen, fibrin
What are surface forces? - ANSWER>>surface tension due to water-air interface
What is airway resistance? - ANSWER>>opposition to flow caused by the forces of
friction; primarily determined by airway radius
What is the distensibility of the lungs? - ANSWER>>ease with which the lungs can be
inflated
What is lung distensibility increased in? - ANSWER>>neonates and children;
emphysema
What is lung distensibility decreased in? - ANSWER>>elderly;
pneumonia, pulmonary edema, ARDS, atelectasis, fibrosis
What is surfactant? - ANSWER>>complex substance lining the alveoli and smallest
bronchioles containing phospholipids and a number of apoproteins which reduces
surface tension throughout the lungs, thereby contributing to its general compliance;
stabilizes the alveoli and keeps them dry
What produces surfactant? - ANSWER>>produced by the Type II alveolar cells
What is Ohm's law? - ANSWER>>velocity = driving force/resistance