File:Physiology - a manual for students and practitioners (1892) (14592417027).jpg

Identifier: physiologymanual00mann (find matches)
Title: Physiology : a manual for students and practitioners
Year: 1892 (1890s)
Authors: Manning, Frederick A
Subjects: Physiology
Publisher: Philadelphia : Lea Brothers
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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left in-ternal jugular and subclavian veins. Does chyle undergo change in thelacteals ? Yes. Peptones, as such, are notfound in the blood nor in the thoracicduct, and in the same way sugar isnot more abundant in chyle afterabsorption than in the blood; norcan we fully account for the fatswhich are absorbed. The trace islost, to a great degree, after absorp-tion of most substances, and we donot know the exact history of themetamorphoses which render themfit for tissue-building. What elements are chiefly takenup by the portal system?All elements to a greater or lessdegree, but the crystallizable sub-stances are taken up in greater pro-portion by the blood-vessels than bythe lacteals. Thus we find thatsugars and salts seem to pass intothe portal system, and the proteids and fats into the lacteal system in a I.acteals and Lymphatics during Di- little greater proportion. ^^* * What is the appearance of chyle in the lacteals? It is opacjue, whitish, milky from the minute fat-globules which
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62 ANIMAL HEAT. are suspended in it (emulsion). The basis of the fluid found inthe lacteals is lymph, and it is only during digestion that the lymphin the visceral lacteals becomes chylous. What is the character of lymph ? It is a limpid, watery fluid, which differs from blood-plasma onlyin that it is somewhat more watery. Like plasma, the lymph co-agulates or clots on exposure to the air, but the clot is not so firm,and the clotting is due to the presence of fibrinogen and globulin.Chyle is lymph in which there is present an increased amount offatty and proteid material. What conditions favor the absorption of food ? To be absorbed by the blood-vessels or lacteals we must havesubstances in (1) a fluid state, and the more dilute in solution themore ready the absorption ; insoluble substances are not apprecia-bly affected by this process, nor are any dense solutions readilytaken up. (2) The rapid removal of the absorbed matter and therenewal of fresh blood in the capillaries is of impo

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