Respiratory System: Exam objective type questions with answer

Breathing is basically the process of moving air into and out of the lungs. Breathing is accomplished by manipulating the pressure gradient between the surrounding atmosphere and the thoracic cavity. For all practical purposes, the pressure of the surrounding atmosphere can be considered a constant. Thus, the desired pressure gradients …

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Breathing is basically the process of moving air into and out of the lungs.

Breathing is accomplished by manipulating the pressure gradient between the surrounding atmosphere and the thoracic cavity. For all practical purposes, the pressure of the surrounding atmosphere can be considered a constant. Thus, the desired pressure gradients are achieved by changing the pressure within the thoracic cavity. The pressure in the thoracic cavity alternates so that it is less and then greater than the pressure of the surrounding atmosphere.

Respiratory System: Exam objective type questions with answer

1) Which of the following discharge spontaneously during quiet breathing

a. stretch receptors in lungb. motor neurons in respiratory muscles
c. dorsal respiratory group of neuronsd. ventral respiratory group of neurons

Ans. c

2) Pneumatic center functions primarily to

a. limit inspirationb. prolong expiration
c. decrease rated. discharge inspiratory action potentials

Ans.a

3) Which of the following is the effect of negative G on the eye

a. temporary blinding with redoutb. blackout of vision within few seconds
c. no effectd. redout and blackout

Ans. a

4) Airway resistance

a. increases in asthamab. decreases in emphysema
c. increases in paraplegic patientsd. does not affect work of breathing

Ans. a

5) Decrease on PCO2, decrease in H+ and increased PO2 causes

a. hyperventilationb. hypoventilation
c. hypercapnoead. hypoxia

Ans. b

6)  Herring-Breur inflation reflex in human being

a. decreases the rate of respirationb. is not activated until the tidal volume increases above 1.5 lit
c. is an important factor in normal control of ventilationd. is activated only when tidal volume is les than 1 lit.

Ans. b

7) Total vital capacity is decreased but timed vital capacity is normal in

a. bronchial asthamab. scoliosis
c. chronic bronchitisd. all the above

Ans. b

8. The intrapleural pressure at the end of deep inspiration is

a. – 4mm Hgb. + 4 mm Hg
c. – 6mm hgd. + 6 mm Hg

Ans. a

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