. Une civic biologie : présentés dans des problèmes. Biologie ; l'assainissement. 298 DKiKSTIOX ABSOKPTIOX Ce tube alimentaire et une glande n. Les enzymes. - - Dans l'homme il y a la glande salivaire de la bouche, les glandes gastriques de l'estomac, le pancréas et le foie, les deux derniers liés à l'intestin grêle, et les glandes intestinales dans les parois de l'intestin. En plus de glandes qui à la digestion il y a plusieurs autres dont nous parlerons plus tard. Comme nous l'avons déjà appris, une glande est un ensemble de cellules dont la forme de matériel dans le corps et fabrique d'elle quelque chose qui est plus tard

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. A civic biology : presented in problems. Biology; Sanitation. 298 DKiKSTIOX AND ABSOKPTIOX food tube What a Gland Does. Enzymes. - - In man there are the saliva gland of the mouth, the gastric glands of the stomach, the pancreas and liver, the two latter connected with the small intestine, and the intestinal glands in the walls of the intestine. Besides glands which aid in digestion there are several others of which we will speak later. As we have already learned, a gland is a collection of cells which takes up material from within the body and manufactures from it some- thing which is later poured out as a secretion. An example of a gland in plants is found in the nectar- secreting cells of a flower. Certain substances, called enzymes, formed by glands cause the digestion of food. The enzymes secreted by the cells of the glands and poured out into the food tube act upon insoluble foods so as to change them to a soluble form. They are the prod- uct of the activity of the cell, although they are not Diagram of a gland. i, the common tube J which carries off the secretions formed in themselves alive. We do the cells lining the cavity c; a, arteries t k h b t carrying blood to the glands; v, veins taking blood away from the glands. .enzymes themselves, but we can observe what they do. Some enzymes render soluble different foods, others work in the blood, still others probably act within any cell of the body as an aid to oxidation, when work is done. Enzymes are very sensitive to changes in temperature and to the degree of acidity or alkalinity l of the material in which they act. We will find that the enzymes found in glands in the mouth will not act long in the 1 The teacher should explain the meaning of these terms.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Hunter, George W. (George Willi

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