Experiments Upon the Circulation of the Blood Throughout the Vascular System; On Languid Circulation on the Motion of the Blood, Independent of the ... Heart and on the Pulsations of the Arteries - Softcover

Inhaltsangabe

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1801. Excerpt: ... Spallanzani did not confine his experiments to one species of animals. On the contrary, he ex-. tended grcc very little inferior to the nerves.--I. Lesions of the heart produce consequences equally fatal as those of the brain. Animals die sooner after the destruction of the first organ, than on being deprived of the second.--II. The compression or division of a vein, and especially of an artery, produce the same effects as those of a nerve; viz, palsy, atrophy, he.--III. The injecting of a fluid into a blood vessel, or rather its commixture with the blood, occasions subsullus tendinum, convulsions, in a word, a variety of phenomena similar to those produced by the pricking of a nerve.--IV. The properties of vigour, strength, ar.d health, are in proportion to the evolution of the sanguiferous system, the concomitant of vigorous and robust constitutions, at the age of manhood.--V. The nervous power has not so great an influence on the circulation as is commonly conceived: it can, however, disturb, accelerate, or retard, the motion of the blood. But the vascular, in its turn, exercises the most powerful action on the nervous system; even inducing, in seme cases, (as in a slate of lethargy,) the almost total suspension of its energy. Besides, such is the influence of the heart on the brain, that its distance from, or nearness to that organ, is in some measure decisive of the sagacity and activity of animals; thus they are found to be more stupid, and limited in their faculties, in proportion to the length of the neck; and, consequently, the distance of the hi art from the brain, and vice versa. This law seems applicable even to the human, tended them to salamanders, tadpoles, acquatic and land frogs, and to grey and green coloured human species. It seldom hap...

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.