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Bio 131 week 3
bio-131
| Question | Answer |
|---|---|
| For carbon dioxide levels to remain constant during exercise, which of the following factors must be elevated? | alveolar ventilation |
| A lung that loses elastic fibers (as in emphysema) would exhibit which of the following characteristics? | increased pulmonary compliance |
| Which of the following ventilatory patterns would result in the greatest ventilation per minute (assume constant dead space)? | 8 840 |
| 4. Question : According to Poiseuille's law, which of the following statements are true if we wish to maintain a constant flow of gases? | Halving the tube radius will require a 16-time increase in driving pressure. |
| Which of the following factors would tend to increase the elastic component of the work of breathing? | decreased compliance of the lungs or thorax and increased VT |
| What is ventilation that is insufficient to meet metabolic needs called? | hypoventilation |
| What happens during normal inspiration? | I.The Ppl decreases further below atmospheric. II.The transpulmonary pressure gradient widens. III.Palv drops below that at the airway opening. |
| Regional factors affecting the distribution of gas in the normal lung result in which of the following? | More ventilation goes to the bases and lung periphery. |
| What term is used to note the difference between inspiratory lung volume and expiratory lung volume at any given pressure? | hysteresis |
| A fibrotic lung would exhibit which of the following characteristics? | decreased lung compliance |
| What is the single best indicator of the adequacy or effectiveness of ventilation? | PaCO2 |
| Which of the following statements about alveolar pressure (Palv) during normal quiet breathing is true? | It is negative during inspiration and positive during expiration. |
| All of the following will cause an increase in the pressure energy required for inspiration EXCEPT which one? | increased compliance |
| In healthy individuals, what may lead to airway collapse? | forced exhalation to RV |
| What is the primary function of the lungs? | gas exchange |
| How is compliance computed? | change in volume/change in pressure |
| Which of the following formulas is used to compute the mechanical work of breathing? | change in pressure x change in volume |
| Which of the following ventilatory patterns would result in the MOST wasted ventilation per minute (assume constant physiologic dead space)? | 30 170 |
| In what portion of the lungs does alveolar dead space normally occur? | apices |
| In a normal individual lying on the right side (right side down), which of the following conditions would be true? | The right lung would receive the most ventilation. |
| Which of the following diseases or disorders is most likely to result in an increased VD/VT ratio? | pulmonary embolus |
| During normal inspiration, which of the following occurs? | Alveoli at the apexes expand less than those at the bases |
| For healthy individuals at rest, which of the following statements about exhalation is true? | Exhalation will be passive, due to inspiratory stored potential energy. |
| How can the body effectively compensate for an increased VDphy? | increased tidal volume |
| During expiration, why does gas flow out from the lungs to the atmosphere? | Palv is greater than at the airway opening. |
Created by:
jseyfried
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