Relationship between depth of breathing and expiratory duration in de cerebrated cats

Glebovskii, V.D.; Gizatullina, N.S.

Fiziologicheskii Zhurnal SSSR Imeni I M Sechenova 63(4): 524-531


ISSN/ISBN: 0015-329X
Accession: 006296493

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In decerebrated cats, tidal volume (Vt) increased from apnea to maximal values as a result of rebreathing. With vagus nerves intact, Vt increment was accompanied by shortening of both inspiratory (Ti) and expiratory (Te) phases. The relationship of Te vs. Ti was mainly linear. Decrease of Te with progressing hyperpnea was determined by impulses from lung mechanoreceptors. After vagotomy, Vt increase was accompanied by Te increments. Bulbopontine respiratory mechanism reacted to chemical stimuli by increasing Te. The constant relationship between Ti and duration of the next expiration disappeared.