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Show The I'ulo. The blond is in a state of constant circulation circu-lation through tho system, propelled by i, i. ...... ..i. i ma iii-mii iiiiuiiKii ma uru.l ic,, auu iir turned to the same orau through the veins. The arterial current conveys material ma-terial for nutriment, heat and force to all the tissues; the venous current receives the dead waste of th4 tisnues und conveys it to the different eliminating organs. The propulsive action of the hpart is due to its successive contractions. These contractions con-tractions occur about seventy times a minute min-ute in a healthy male adult, more frequent in wonieu, and much moro frequently ia infants and children, beiug at birth from one hundred and thirty to one hundred aud forty, gradually sinking to about one hundred at the sixth year, and to ninety or eixhty-tive at the tenth. The arteries are unliko the veins in that they shure in the beating of the heart; but the heating of the heart is readily perceived per-ceived only where an urtery pauses over a bone near tho surface, or when some in-llamnmtion in-llamnmtion of a part causes an enlargement, enlarge-ment, of an artery aud an unusual seiisl- nvenessoi uie accompanying nerves, ia its iionnai condition the pulse is most conveniently con-veniently felt at the wrist. The blood is tho natural stimulus of the heart, and when the poison of disease changes the character of the blood the ac-Li ac-Li m of the, he-art is correspondingly affected. affect-ed. It is f b-o affected by organic disorders of the heart and arteries, by general weakness, weak-ness, hy nervous excitements, by the state of the stomach and by stimulants or depressants de-pressants of various kinds. Hence, as the heart beats ami the arterial beats accord, the character of the pulse is of great service serv-ice in determining the patient's physicial condition. It will lie seen that in feeling the pulse j Bge and sex are always to l! taken into account. ac-count. Further, one's pulse when lying down is about live beats slower, and when sitting about ten beats slower than when standmir. Youth's Coninanion. |