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Klarinet Archive - Posting 000598.txt from 1999/04

From: David Blumberg <>
Subj: [kl] Re: Diaphragm is Voluntary - partly
Date: Mon, 12 Apr 1999 22:22:02 -0400

The diaphragm is Voluntary during inspiration, and in-voluntary during
expiration. When the diaphragm contracts, the dome descends and the base of
the thorax expands. It also increases the vertical diameter of each half of
the thorax. Its contraction elevates the lower ribs (except the last). When
the dome descends, the chest expands, air is drawn into the lungs and the
abdominal viscera, related to its under surface, are displaced. When the
diaphragm relaxes, it recoils into its higher domed position in a purely
passive manner. This occurs during expiration and when expiration is deep,
largely due to the increased activity of the abdominal muscles, the
diaphragm is passively forced upwards.

David Blumberg

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