Adaptation to Altitude-Hypoxia in Vertebrates by Prof. Pierre Bouverot (auth.) PDF

By Prof. Pierre Bouverot (auth.)

ISBN-10: 3642823165

ISBN-13: 9783642823169

ISBN-10: 3642823181

ISBN-13: 9783642823183

Adaptation to altitude hypoxia is characterised via a range offunctional adjustments which jointly facilitate oxygen trans­ port from the ambient medium to the cells of the physique. All of those adjustments could be noticeable at one time or one other during hypoxic publicity. but, as already under pressure (Hannon and Vogel, 1977), an exam of the literature offers just a sketchy and sometimes conflicting photograph of the precise nature of those adjustments and the way they have interaction as a functionality of publicity length. this can be in part as a result of restricted variety of variables explored in a given research, however it can be caused by changes in experimental layout, transformations between species in susceptibility to hypoxia, nonstandardized experimental stipulations, loss of right keep an eye on of actual (e. g. , temperature) and physiological variables (e. g. , physique mass), failure to take measurements at key sessions of publicity, and gaps in wisdom approximately a few primary mechanisms. in addition the to be had info on animals local to excessive altitude are meager and/or inconclusive. huge extra paintings lower than well-controlled experimental stipulations is needed prior to a close photo may be made. however, it's been a guideline within the prepara­ tion of this monograph quite to summarize the greatly dis­ persed fabric that constitutes the comparative body structure of model to excessive altitude right into a coherent photo, than to supply a complete survey of the field.

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Extra info for Adaptation to Altitude-Hypoxia in Vertebrates

Example text

During the transient constitution of an "oxygen debt," (2) during bursts of intense, supramaximal activity, (3) when the ambient P 02 decreases down to a value below that of the critical P 02 at which the overall O 2 conductance is no longer able to meet the oxygen demand. In these circumstances, organisms rely on anaerobic metabolism, at least in part; then, MAN in Eq. 1) is no longer negligible. Various biochemical reactions can be involved in anaerobic metabolism (Chap. 6). Those that yield products such as succinate and alanine appear to play a minor role.

Yet the splitting of ATP and phos33 phocreatine (PC) transiently yields energy with neither O 2 consumption nor lactate production; this is the alactic mechanism. 1 Alactic Mechanism This mechanism contributes significantly to the energy requirement [E in Eq. 7)] only in the very early phase of muscular exercise. Present knowledge is restricted to humans, as recently reviewed by di Prampero (1981). 5 km (di Prampero et al. 1982). 2 Lactic Mechanism Technological difficulties preclude the exact contribution of the lactic mechanism in the energy expenditure to be assessed.

A valid comparison can be made, using the ratio VjM 02 ' which is the M02-specific ventilation, or the convection requirement of air or water per unit of oxygen uptake. This ratio, sometimes called respiratory equivalent, designates the volume of medium which must be passed over the gas-exchange surface to effect delivery of a unit quantity of oxygen. It is easily derived by normalizing Eqs. 2) for M02 Y 1 1 1 M02 Cin 02 - Cout02 E02 . Cin02 E02 . f30 2 • Pin02 . 4) states that the product (YjMo)· E02 must increase when the O 2 availability (Cin 02 = f30 2 • Pino,) decreases in the inhaled medium.

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Adaptation to Altitude-Hypoxia in Vertebrates by Prof. Pierre Bouverot (auth.)


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