Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . , pulmo-nary artery; A, pulmonary veins. Fig. 10.—Diagram of the Pericardium —a, a, auricles; «, v, ventricles; p,p,pericar-dium. 62. The heart itself is divided in the direction of italength, into two halves, each representing a single walls of the left half are thicker and stronger thanthose of the right. The reason is obvious: the rightsends its contents only to the lungs, in its immediate
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . , pulmo-nary artery; A, pulmonary veins. Fig. 10.—Diagram of the Pericardium —a, a, auricles; «, v, ventricles; p,p,pericar-dium. 62. The heart itself is divided in the direction of italength, into two halves, each representing a single walls of the left half are thicker and stronger thanthose of the right. The reason is obvious: the rightsends its contents only to the lungs, in its immediate prox-imity, while the left propels the blood to all parts of thesystem. The walls of the auricles are also much thinnerthan those of the ventricles, which require greater strengthto act as propelling organs. The office of the auricles is How is the heart protected from friction against other organs ? Describethe pericardium. How is the heart divided? Which half has the thickestand strongest walls? Why are the walls of the left half thicker and strongerthan the right? How do the walls of the auricle compare with those of theventricle? What is the office of the auricle? THE BLOOD. 38. only to receive the blood as it flows from the veins, andtheir walls are accordingly thin and flabby.* 63. The auricles and ventriclesare separated from each other bytriangular folds of membrane {) on the right side, called tricus-pid valves (three-pointed), and onthe left bicuspid (two-pointed)valves. These valves are attachedto the walls of the ventricle by lit-tle muscular cords, which preventthem from being forced up intothe auricle during the contractionsof the ventricle. {Figs. 3 and 4,Pl. IV.) This simple mechanism r Fig. .1.—Section of Right Side is so perfect as whollv to prevent ? «« heart.—«, rightawicie; x J r b, ventricle; c, orifice between the the flowing back Of the blood intO tricuspid valves, <2; «, c, ascending 0 and descending venae cava?; /, put the aur
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysiologicalprocess
