The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . flexed or folded on the arm by the combined action ofthe biceps and triceps. When the biceps (a) shortens and the triceps (4) lengthens, flexionis produced. When the triceps shortens and the biceps lengthens, extension is flexion the long axes of tho sarcous elements of the biceps muscle (a) are directed trans-versely; thoseof the triceps (J) longi
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . flexed or folded on the arm by the combined action ofthe biceps and triceps. When the biceps (a) shortens and the triceps (4) lengthens, flexionis produced. When the triceps shortens and the biceps lengthens, extension is flexion the long axes of tho sarcous elements of the biceps muscle (a) are directed trans-versely; thoseof the triceps (J) longitudinally. These conditions are reversed in a, the centripetal action of muscle is seen {vide arrows marked i); at b, its centrifugalaction {vide arrows marked/). (Compare with arrows of Fig. 130.) d, Coracoid process ofscapula from which the short head of the biceps arises, e, Insertion of the biceps into theradius, f, Long head of the triceps, g, Insertion of triceps into the olecranon of the , Hand.—-Original. That muscles possess a centripetal and centrifugal power—, apower by which they alternately shorten and elongate—and that oneset of muscles is never employed for violently pulling or drawing. PHYSIOLOGY OF THE CIRCULATION. 181 out another set, is abundantly proved by the action of the heart andthe hollow muscles with sphincters, such as the stomach, bladder,rectum, uterus, etc. The heart pulsates in the embryo while yet amass of cells, and before it is provided either with cavities, blood,or muscular fibres. The different compartments of the heart openand close after the organ is cut out of the body, and when it isdeprived of blood ; but the deprivation of blood prevents the auriclesacting upon the ventricles, and the converse. The auricles andventricles are to be regarded as anatomically and functionally dis-tinct. That the auricles when they close do not forcibly distendor open the ventricles, is evident from the fact that the ven-tricles
Size: 1734px × 1441px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectblo, booksubjectblood
