Respi Physio MCQ Flashcards
- Increased parasympathetic activity causes the resistance to airflow in the bronchioles to:
A. Increase
B. Decrease
C. Stay the same
A. Increase
- Which of the following is true?
A. Intrapleural pressure is always greater than intrapulmonary pressure
B. Intrapulmonary pressure is always greater than atmospheric pressure
C. Intrapleural pressure is always less than atmospheric pressure
D. Intrapulmonary pressure is always less than atmospheric pressure
C. Intrapleural pressure is always less than atmospheric pressure
Contraction of the diaphragm and external intercostal muscles causes thoracic volume to \_\_\_\_\_\_\_\_\_\_ which causes lung volume to \_\_\_\_\_\_\_\_\_\_ which causes intrapulmonary pressure to \_\_\_\_\_\_\_\_\_\_. A. Decrease; Increase; Decrease B. Decrease; Decrease; Increase C. Increase; Increase; Decrease D. Increase; Decrease; Increase E. Increase; Increase; Increase
C. Increase; Increase; Decrease
4. The scalenes and sternocleidomastoids are predominantly involved in: A. Active inspiration B. Active expiration C. Quiet inspiration D. Quiet expiration
A. Active inspiration
As surfactant production decreases, lung compliance will:
A. Increase
B. Decrease
C. Stay the same
B. Decrease
- If John’s vital capacity is 4.5L and his tidal volume is 525cc, then what is his inspiratory reserve volume?
A. 3975mL
B. 2075mL
C. 1050mL
D. Cannot be determined from the information given
D. Cannot be determined from the information given
- What test measures the amount of gas expelled when one takes a deep breath and exhales maximally and rapidly?
A. Forced expiratory volume test
B. Forced vital capacity test
C. Forced residual capacity test
D. Forced internal thoracic volume assessment
B. Forced vital capacity test
- Which of the following is not a component of the respiratory membrane?
A. Plasma membrane of the alveolar cell
B. Plasma membrane of the capillary endothelial cell
C. Fused basal laminae of the alveolar and the capillary endothelial cell
D. All of the above are members of the respiratory membrane
D. All of the above are members of the respiratory membrane
- If alveolar PCO2 is high, the diameter of the bronchiole servicing that tissue will:
A. Increase
B. Decrease
C. Stay the same
A. Increase
The binding of oxygen to haemoglobin is characterized as: A. Compliant B. Irreversible C. Reversible D. Non-compliant
C. Reversible
11. The dorsal respiratory group of the medulla oblongata is active during: A. Quiet inspiration B. Forced inspiration C. Forced expiration D. A and B E. B and C
D. A and B
- Lowered plasma oxygen levels are the most powerful respiratory stimulant.
A. True
B. False
B. False
- Total lung capacity is equal to:
A. Vital capacity x Tidal volume
B. Functional residual capacity + Expiratory reserve volume
C. Anatomical dead space + Alveolar dead space
D. Residual volume + Vital capacity
D. Residual volume + Vital capacity
- Select the correct statement about oxygen transport in blood.
A. During normal activity, a molecule of Hb returning to the lungs contains one molecule of oxygen
B. As pH decreases, oxygen’s affinity for Hb increases
C. A 50% oxygen saturation level of blood returning to the lungs might indicate a higher activity level than normal
D. All of the above
E. None of the above
C. A 50% oxygen saturation level of blood returning to the lungs might indicate a higher activity level than normal
16. Which of these values would normally be the highest? A. Tidal volume B. Inspiratory reserve volume C. Expiratory reserve volume D. Residual volume E. Vital capacity
E. Vital capacity
17. Most CO2 is transported in the blood in the form of: A. Dissolved gas B. Carbaminohemoglobin C. Bicarbonate ion D. Carboxyhemoglobin
C. Bicarbonate ion
- As plasma PCO2 increases, plasma pH will:
A. Increase
B. Decrease
C. Stay the same
B. Decrease
As plasma PCO2 increases, both the rate and depth of respiration will:
A. Increase
B. Decrease
C. Stay the same
A. Increase
- Stimulating the cephalic end of a cut vagus nerve would cause respiration to:
A. Cease because of the lung stretch receptor reflex
B. Increase in rate because of the increased activity of the dorsal respiratory group
C. Increase in depth because of the increased sympathetic activity
D. None of the above
A. Cease because of the lung stretch receptor reflex
- The loudness of a person’s voice depends on:
A. The thickness of the vestibular folds
B. The length of the vocal folds
C. The strength of the intrinsic laryngeal muscles
D. The force with which air rushes through the glottis
E. The thickness of the true vocal folds
D. The force with which air rushes through the glottis
Surfactant causes alveolar surface tension to:
A. Increase
B. Decrease
C. Stay the same
B. Decrease
- Inspiratory capacity is:
A. The total amount of air that can be inspired after a tidal expiration
B. The total amount of exchangeable air
C. Another name for functional residual capacity
D. The amount of air inspired after a tidal inspiration
E. A and C are correct
A. The total amount of air that can be inspired after a tidal expiration
24. The most powerful respiratory stimulant in a healthy person is: A. Decreased tissue oxygen concentration B. Increased plasma PCO2 C. Increased CSF pH D. Decreased CSF pH
D. Decreased CSF pH
Which of the following changes occur as conducting tubes become smaller?
A. Cartilage rings are replaced by irregular cartilage plates
B. Mucosal epithelium changes
C. Smooth muscle content increases
D. All of the above
E. 2 of the above
D. All of the above
26. A premature baby usually has trouble breathing. However, the respiratory system is completely developed by: A. 17 weeks B. 22 weeks C. 24 weeks D. 28 weeks E. 20 weeks
C. 24 weeks
D. 28 weeks
27. Possible causes of hypoxemia include: A. Decreased atmospheric oxygen content B. Tracheal obstruction C. Pneumonia D. A and B are correct E. A, B and C are correct
E. A, B and C are correct
- Tidal volume is air:
A. Remaining in the lungs after forced expiration
B. Exchanged during normal breathing
C. Inhaled after quiet inspiration
D. Forcible expelled after normal expiration
B. Exchanged during normal breathing
- The RBC count increases after an individual spends significant time at a higher altitude because:
A. Temperature is lower at higher altitudes
B. Basal metabolic rate is lower at higher altitudes
C. Basal metabolic rate is higher at higher altitudes
D. Atmospheric PO2 is higher at higher altitudes
E. Atmospheric PO2 is lower at higher altitudes
E. Atmospheric PO2 is lower at higher altitudes
30. Most oxygen carried in the blood is: A. In solution with the plasma B. Combined with plasma proteins C. Chemically combined with a heme group D. Carried as HCO3- E. Bound to the amino acid valine on the beta chain of hemoglobin
C. Chemically combined with a heme group
- When the inspiratory muscles contract:
A. The diameter of the thoracic cavity increases
B. The length of the thoracic cavity increases
C. The volume of the thoracic cavity is decreased
D. The diameter and length of the thoracic cavity both increase
E. None of the above
D. The diameter and length of the thoracic cavity both increase
32. Damage to which of the following would result in cessation of breathing? A. The pneumotaxic centre B. The medulla C. Lung stretch receptors D. The apneustic centre E. The pons
B. The medulla
- Compliance of the lungs is:
A. Decreased due to an increase in collagen fibres
B. Decreased due to pulmonary hypertension
C. Increased due to increased sympathetic stimulation of lung smooth muscles
D. Higher in the fetus than newborn
E. Increased during exercise
A. Decreased due to an increase in collagen fibres