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Physiology

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Respiration

Question
28 out of 33
 

Diaphragm is lowest in



A sitting
B standing

C supine
D prone

Ans. A sitting

I. Skiagraphy shows that the height of the diaphragm in the thorax varies considerably with the position of the body.

II. It stands highest when the body is horizontal and the patient on his back, and in this position it performs the largest respiratory excursions with normal breathing.

III. When the body is erect the dome of the diaphragm falls, and its respiratory movements become smaller.

IV. The dome falls still lower when the sitting posture is assumed, and in this position its respiratory excursions are smallest. These facts may, perhaps, explain why it is that patients suffering from severe dyspnœa are most comfortable and least short of breath when they sit up.

V. When the body is horizontal and the patient on his side, the two halves of the diaphragm do not behave alike.

VI. The uppermost half sinks to a level lower even than when the patient sits, and moves little with respiration; the lower half rises higher in the thorax than it does when the patient is supine, and its respiratory excursions are much increased.

Respiration Flashcard List

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