. Elements of human physiology. Physiology. THE MECHANISMS OF DIGESTION 805 Section 2 SALIVAEY DIGESTION The saliva is a mixture of the secretions of the sub- maxillary, sublingual, parotid, and small mucous and serous glands of the buccal cavity (Fig. 160). It has a low specific gravity, 1002 to 1009; it is slightly alkaline, and slimy from the presence of mucin. On microscopic examination it is seen to contain epithelial scales and * salivary corpuscles '—small Fig. Dissection to display the salivary glands, a, sublingual gland ; b, submaxillary gland; c, parotid gland; d, common openi
. Elements of human physiology. Physiology. THE MECHANISMS OF DIGESTION 805 Section 2 SALIVAEY DIGESTION The saliva is a mixture of the secretions of the sub- maxillary, sublingual, parotid, and small mucous and serous glands of the buccal cavity (Fig. 160). It has a low specific gravity, 1002 to 1009; it is slightly alkaline, and slimy from the presence of mucin. On microscopic examination it is seen to contain epithelial scales and * salivary corpuscles '—small Fig. Dissection to display the salivary glands, a, sublingual gland ; b, submaxillary gland; c, parotid gland; d, common opening of ducts of submaxillary and sublingual glands; i, opening of duct of parotid gland. round cells with granular contents, which are probably leucocytes escaped from the tonsils. It consists of— Water. Salts, especially potassium and sodium chlorides. Traces of albumen. Mucin. A diastatic ferment (ptyalin). Occasional traces of potassium sulphocyanide. Gases, especially carbon dioxide, with traces of oxygen and nitrogen. The amount of saliva secreted in twenty-four hours varies from one-half to two litres. The greater part is re-absorbed in the alimentary canal. 20. 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 Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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