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Examples: Grammar Rules for Comma Us The Best Tropical Ho R Mathematical symbo Marketing Analyst c uOakton Neu Gener g calculator font: ? help tles Exam Page 5 1 (10 pts) (10 pts) 3(10 pts) 4 (10 pts 5 (10 pts) 6 (10 pts) 7 (10 pts) 8 (10 pts 9 (10 pts) 10 (10 pts) The Lungs and Gas Exchange Enter T or F (true or false) in the answer blanks. The gas-exchange region in the lungs must be: moist, thin and large During inhalation, the diaphragm is flattened. During exhalation, the lungs contain negative pressure Because of diffusion, oxygen naturally moves out of the blood and into the lungs Each red blood cell contains from 1-5 molecules of hemogtobin. Answer the following question Explain why incomplete ventilation is important for effective gas exchange m in progress 0:13:21 BACKNEXT REPORT A PROBLEMExplanation / Answer
The gas-exchange region in the lungs must be moist, thin and large. - (T) True
cause: the gases diffuse across a fluid medium and rate of diffusion varies directly with surface area and inversely with thickness of diffusing membrane.
During inhalation, the diaphragm is flattened. - (T) True
cause: As the diaphragm is flattened, the vertical diameter increases, increasing thoracic volume, decreasing intrathoracic and intra-pleural pressure, causing inhalation.
During exhalation, the lungs contain negative pressure. - (F) False
cause: For exhalation, the intrapleural pressure has to be positive in comparision to the atmosphere.
Because of diffusion, oxygen naturally moves out of the blood and into the lungs. - (T) True
cause: Diffusion occurs from higher partial pressure (alveoli) to lower partial pressure (pulmonary blood vessel) of oxygen.
Each red blood cell contains from 1-5 molecules of hemoglobin. - (F) False
cause: One molecule of hemoglobin can bind maximally to 4 molecules of oxygen.
Explain why incomplete ventillation is important for effective gas exchange.
Effective gas exchange in luns require adequate alveolar ventillation and pulmonary perfusion (blood flow). Only then, the exchange of gases can occur adequately. If any of these two factors are compromised, then exchange of gases will decrease.
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