. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . the abdominal cavity be-low the liver and stomach (Fig. 44).The assisting glands are for the pur-pose of secreting from the blood aliquid for softening and dissolvingthe food so that it may be taken intothe tissue. They are the salivaryglands, forming the saliva or spit,and the liver i\i\^ pancreas, adjacentto the stomach. Mucous Membrane. — All sur-faces exposed to the air are coveredwith one or more layers of epithelialcells. If the surface is not freelyexposed,
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . the abdominal cavity be-low the liver and stomach (Fig. 44).The assisting glands are for the pur-pose of secreting from the blood aliquid for softening and dissolvingthe food so that it may be taken intothe tissue. They are the salivaryglands, forming the saliva or spit,and the liver i\i\^ pancreas, adjacentto the stomach. Mucous Membrane. — All sur-faces exposed to the air are coveredwith one or more layers of epithelialcells. If the surface is not freelyexposed, so that it may be cleansedby air, sunshine, and washing, thecells have the power to make fromthe blood a thin, slippery substancecalled mucus to serve as a mucus-secreting cells, withthe thin layer of underlying con-nective tissue, form mucous mem-brane (Fig. 45). It lines the entire alimentarv canal and all other •J tubes of the body touched by air. The Mouth. — The important organs in the mouth arethe tongue and teeth. The tongue is composed of severalmuscles covered with mucous membrane, and is used in. Fig. 41. — Diagram showingthe relations of the organsof the body cavity, viewedfrom the side, a, vermi-form appendix; c, spinalcolumn inclosing the spinalcord; d, diaphragm; e,esophagus; ?, the great vein,or vena cava; k, kidney;lu, lung; //, large intestine;p, pancreas; s, spleen; t,trachea; u, ureter; v, venacava. 78 THE DIGESTIVE SYSTEM
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