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Devoir 4 (4 questions en tout)

Devoir 4 (4 questions en tout) - Symbolesutiliss o...

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Voici les r é ponses aux 3 questions.  Symboles utilis é s:  o DC = d é bit cardiaque (= FC x VS) o FC = fr é quence cardiaque o PA = pression art é rielle (= DC x RP) o RP = r é sistance p é riph é rique o RV = retour veineux o VS = volume systolique Pour les 3 situations, la variable est le changement de pression art é rielle, et les r é cepteurs qui  d é tectent ce changement sont les baror é cepteurs de la crosse de l'aorte et des sinus carotidiens. 1. Vous vous mettez  à  courir rapidement. FC augmente; PA augmente l é g è rement Centre de r é gulation     : centre cardiovasculaire du tronc c é r é bral (et hypothalamus) Effecteurs     : o Coeur: (augmentation de FC et de VS) --> augmentation de DC o R é seau art é riel de la peau, des visc è res abdominaux, ...: vasoconstriction pour  augmenter RP et RV (en diminuant la circulation sanguine dans ces organes moins  essentiels) o R é seau veineux: vasoconstriction pour augmenter RV Variable     : diminution initiale de la PA caus é e par une vasodilatation des art è res et art é rioles  des muscles squelettiques.
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  • Fall '10
  • MichelDésilets
  • centre, Activation des muscles squelettiques ­­> vasodilatation de leurs art ères et artérioles , Exercice ­­> stress ­­> activation des centres cardioacc élérateur et vasomoteur par , l'hypothalamus ­­> augmentation de DC et RP ­­> augmentation de PA au­del à de sa valeur 

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