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Abstract:

1. In unanesthetized toads, Bufo arenarum Hensel, intermittent increases of blood pressure and heart rate were invariably observed when spontaneous breathing increased. When blood pressure reached its maximum the polypnea stopped abruptly and both heart rate and blood pressure declined slowly to their previous values. 2. Sensory stimulation also evoked polypnea followed by hypertension and tachycardia. 3. In the anesthetized animal, artificial lung inflation increased left atrial and mean blood pressure proportionally to the volume of air injected. Similar results were obtained when coelomic instead of lung pressure was increased. In all cases a simultaneous tachycardia was observed. 4. Neither autonomic blockade nor removal of the bulbomesencephalic centres abolished these responses. 5. It is concluded that these pressor and chronotropic effects of breathing are dependent on direct as well as on reflex mechanisms consequent to both coelomic and lung pressure changes. Direct effect of pulmonary venous return (or lower CNS mechanical reflexes) may be important in the intact animal. © 1981 Springer-Verlag.

Registro:

Documento: Artículo
Título:Effect of breathing upon blood pressure and heart rate in the toad, Bufo arenarum Hensel
Autor:Segura, E.T.; Bronstein, A.; Schmajuk, N.A.
Filiación:Laboratorio de Fisiologia del Comportamiento, Instituto de Biologia y Medicina Experimental, Obligado 2490, Buenos Aires, 1428, Argentina
Año:1981
Volumen:143
Número:2
Página de inicio:223
Página de fin:227
DOI: http://dx.doi.org/10.1007/BF00797701
Título revista:Journal of Comparative Physiology ■ B
Título revista abreviado:J Comp Physiol B
ISSN:01741578
CODEN:JCPBD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01741578_v143_n2_p223_Segura

Referencias:

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Citas:

---------- APA ----------
Segura, E.T., Bronstein, A. & Schmajuk, N.A. (1981) . Effect of breathing upon blood pressure and heart rate in the toad, Bufo arenarum Hensel. Journal of Comparative Physiology ■ B, 143(2), 223-227.
http://dx.doi.org/10.1007/BF00797701
---------- CHICAGO ----------
Segura, E.T., Bronstein, A., Schmajuk, N.A. "Effect of breathing upon blood pressure and heart rate in the toad, Bufo arenarum Hensel" . Journal of Comparative Physiology ■ B 143, no. 2 (1981) : 223-227.
http://dx.doi.org/10.1007/BF00797701
---------- MLA ----------
Segura, E.T., Bronstein, A., Schmajuk, N.A. "Effect of breathing upon blood pressure and heart rate in the toad, Bufo arenarum Hensel" . Journal of Comparative Physiology ■ B, vol. 143, no. 2, 1981, pp. 223-227.
http://dx.doi.org/10.1007/BF00797701
---------- VANCOUVER ----------
Segura, E.T., Bronstein, A., Schmajuk, N.A. Effect of breathing upon blood pressure and heart rate in the toad, Bufo arenarum Hensel. J Comp Physiol B. 1981;143(2):223-227.
http://dx.doi.org/10.1007/BF00797701