The diaphragm is the principal muscle of respiration.During the quiet phase of breathing in the supine position,the diaphragm is said to be responsible for of the tidal volume as opposed to sitting or standing when it is responsible for of the tidal volume.

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In the supine position, the diaphragm is responsible for three-fourths of the tidal volume due to the effect of gravity on abdominal contents, which makes diaphragmatic movement more significant. In contrast, when sitting or standing, the diaphragm accounts for two-thirds of the tidal volume, as other muscles of respiration contribute more significantly in these positions.

The Diaphragm Is the Principal Muscle of Respiration