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Show illood iu th Body. The amount of blood in the body is one-thirtieth the weight of the body, or five or six quarts, or eleven or twelve pounds. The average man dies when he has lost one-fifth of his blood. The heart with each contraction ejects six ounces of blood from each ventricle, at a pressure press-ure in the left ventricle of onfi-fourth of an atmosphere. The heart sends all the blood around the body of the average man once every thirty seconds, or in about thirty-five contractions of the organ. A deadly poison injected into the veins kills in fifteen seconds on the average; injected under the skin in about four minutes. A cubio millimeter of blood contains 5,000,000 blood cells in the average man, and about 4,500,000 in the average woman. There are 800 red cells to every one white blood cell. The red cells have an average diameter of 1-3,200 of an inch, the white cells of 1-25,000 of an inch. The specific gravity of blood is 1.053- The frequency of the pulse in the new born is 150; in infants 1 year old, 110; at 3 years, 95; from 7 to 14, 85; in adult man, 75; woman, 80. The respirations aro one-fourth as rapid as the pulse. St. Louis Republic. |