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- W2182447431 abstract "ABSTRACT The normal breathing pattern of Pseudemys scripta (Schoepff) consists of a continuous burst of breaths separated by a variable period of breath holding. Under normoxic conditions, tidal volume was 6·9 ml kg−1 and the number of breaths was 1·9 min−1. Increases in pulmonary ventilation upon stimulation by hypercapnia (3 % CO2) or hypoxia (4 % O2) are caused primarily by increases in the number of breaths per minute due to a shortening of the breath-hold period. Tidal volume and breath duration remain unchanged. The instantaneous breathing frequency (f′ = 60/Ttot) of 35 ± 2min−1 corresponds to continuous pump frequencies that minimize the rate of the mechanical work of breathing in anaesthetized turtles. This indicates that turtles breathe at a combination of tidal volume and f′ that minimizes the power required to ventilate the lungs. To increase ventilation, the breath hold is shortened and more breaths are taken at this optimal combination. Bilateral vagotomy drastically alters the breathing pattern, producing an elevation in tidal volume, a slowing of breathing frequency, and a prolongation of breath duration while total ventilation remains unchanged. These data suggest that periodic breathing in this species may represent an adaptive strategy which is under vagal control and which serves to minimize the cost of breathing." @default.
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- W2182447431 date "1986-09-01" @default.
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- W2182447431 title "Mechanical Analysis of Spontaneous Breathing in the Semi-Aquatic Turtle, <i>Pseudemys Scripta</i>" @default.
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- W2182447431 doi "https://doi.org/10.1242/jeb.125.1.157" @default.
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