New PDF release: A Synopsis of Physiology

By A. Rendle Short and C. I. Ham (Auth.)

ISBN-10: 1483200302

ISBN-13: 9781483200309

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The cardiac beat is initiated at the sinu-auricular node, a tiny nodule of specialized tissue, a cross between nerve and muscle, very vascular, at the junction of the superior vena cava and right auricular appendix. From this the stimulus passes into the auricular muscle% causing its contraction. It is taken up again by the larger auriculoventricular node, in the inter-auricular septum below and to the right of the coronary sinus. From this a bundle of pale muscle (Purkinje fibres, striated at edge only, and beaded), passes down beneath the right side of the septum, then as the A-V bundle passes to the right ventricle, breaks into right and left branches which run beneath the septal endocardium to the apex of the ventricles, and finally is distributed to the ventricular and papillary muscles.

Long refractory period (seen in the heart stopped by the first Stannius ligature—no response to a second stimulus too soon after a first). 4. 'Staircase' contractility (also seen in Stannius heart—the 2nd contraction is bigger than the 1st, 3rd bigger than 2nd, and so on for 4 or 5 beats). 5. Long latent period. 6. Cannot be tetanized. 7. , a weak stimulus either causes a full contraction, or none at all ; whereas with striped muscle contraction increases with strength of stimulus. ) 8. Tone probably absent.

Animal lies still except for occasional deep inspiration. Blood-pressure falls, but on a tracing shows several curves, Traube-Hering curves, due to vasoconstrictor impulses. Pupils dilated. —Great veins and right heart distended with dark fluid blood ; lungs distended, often small haemorrhages. Left heart and arteries empty (except pulmonary artery). —Temporary arrest of respiration. There are three types :-— 1. —Produced by rapid and deep respiration, so that all C0 2 is removed from alveolar air.

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A Synopsis of Physiology by A. Rendle Short and C. I. Ham (Auth.)


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