Anatomy, physiology and hygiene . eased or diminished at times by apparentlyslight causes, especially in young children. Thus, after crying, the pulserises 10 to 20 beats, and is lowered the same amount during sleep. Aftera meal the pulse of an adult has from 5 to 10 beats more per minute thanbefore; 5 beats more when sitting than when lying down ; 10 beats morewhen standing than when sitting; and 10 to 50 more beats when inmotion than when at rest. 2 Capillaries are about y^- of an inch in diameter, and are composedof thin, flat cells, united at their edges. 3 The irrigation system in use in
Anatomy, physiology and hygiene . eased or diminished at times by apparentlyslight causes, especially in young children. Thus, after crying, the pulserises 10 to 20 beats, and is lowered the same amount during sleep. Aftera meal the pulse of an adult has from 5 to 10 beats more per minute thanbefore; 5 beats more when sitting than when lying down ; 10 beats morewhen standing than when sitting; and 10 to 50 more beats when inmotion than when at rest. 2 Capillaries are about y^- of an inch in diameter, and are composedof thin, flat cells, united at their edges. 3 The irrigation system in use in the western part of the United Statesseems to be modelled after the plan of the capillary circulation. Large THE CIRCULATION. — BLOOD. — LYMPH. 155 lar organs the capillaries supply the substance requisitefor secretion; in the villi of the intestine they take upthe elements of the digested food; in the lungs they ab-sorb oxygen and exhale carbon dioxide ; in the kidneysthey discharge waste products collected from other Fig. 67. Injected Cross-section of a Lobule of the Liver, showing the capillary network betweenthe portal and hepatic veins. Magnified 60 diameters. 1, section of intra-lobular vein. 2, its branches collecting- blood from the , inte/-lobular branches of the portal vein connecting with the capillary network, andsupplying the lobule with blood for its nourishment. The capillary circulation thus furnishes, directly or indi-rectly, the materials for the growth and renovation of theentire body. This circulation is usually studied in atissue which is transparent and vascular, such as the web ditches bring water from a reservoir into smaller ditches, ami these intostill smaller ones, which pass between the plants. The water in thesevery small ditches moves slowly, oozing into the soil and among therootlets. 156 THE CIRCULATION. —BLOOD. —LYMPH.
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