Week 5 Knowledge Check with 100% correct answers graded A+

Week 5 Knowledge CheckD - correct answers Intrapulmonary pressure is the ________. a) Difference between atmospheric pressure and respiratory pressure b) Pressure within the pleural cavity c) Negative pressure in the intrapleural space d) Pressure within the alveoli of the lungs A - correct answers Which of the following is INCORRECT? a) Pressure gradient equals gas flow over resistance. b) Gas flow equals pressure gradient over resistance. c) The amount of gas flowing in and out of the alveoli is directly proportional to the difference in pressure or pressure gradient between the external atmosphere and the alveoli. d) Resistance equals pressure gradient over gas flow. D - correct answers The Bohr effect refers to the unloading of ________ in a RBC due to declining blood pH. a) chloride ions b) carbon dioxide c) BPG d) oxygen B - correct answers Which of the following is a conducting zone structure? a) alveolar sac b) terminal bronchiole c) respiratory bronchiole d) alveolar duct A - correct answers The local matching of blood flow with ventilation is ________. a) ventilation-perfusion coupling b) the Bohr effect c) the Haldane effect d) chloride shifting B - correct answers Which of the following INCORRECTLY describes mechanisms of CO2 transport? a) just over 20% of CO2 is carried in the form of carbaminohemoglobin b) attached to the heme part of hemoglobin c) as bicarbonate ions in plasma d) 7-10% of CO2 is dissolved directly into the plasma D - correct answers Select the correct statement about oxygen transport in blood. a) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2. b) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity. c) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently. d) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal. B - correct answers Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by ________. a) osmosis b) diffusion c) active transport d) filtration A - correct answers Which statement about CO2 is FALSE? a) More CO2 dissolves in the blood plasma than is carried in the RBCs. b) Its accumulation in the blood is associated with a decrease in pH. c) CO2 concentrations are greater in venous blood than arterial blood. d) Its concentration in the blood is decreased by hyperventilation. D - correct answers Which of the following maintains the patency (openness) of the trachea? a) surface tension of water b) pseudostratified ciliated epithelium c) surfactant production d) C-shaped cartilage rings D - correct answers Complete the following statement using the choices below. Air moves out of the lungs when the pressure inside the lungs is _________. a. equal to the pressure in the atmosphere. b. greater than the intra-alveolar pressure. c. less than the pressure in the atmosphere. d. greater than the pressure in the atmosphere. D - correct answers Which of the following bones does NOT contain a paranasal sinus? a. Sphenoid b. Maxillary c. Ethmoid d. Nasal e. Frontal E - correct answers Which of the following muscles contracts during quiet expiration? a. Diaphragm b. Internal intercostals c. External intercostals d. Pectoralis minor