. Biology and man. Biology; Human beings. CARBOHYDRATES BY NIGHT AND BY DAY In daylight, photosynthesis normally produces sugar faster than it can diffuse out of the cells and move into growing tissues or into underground ports. Surplus sugar in the leaves, and the sugar brought from the leaves into underground structures, become converted into starch. In the dark the starch that has accumulated in the leaves becomes transformed into sugar, which is carried into tubers or other under- ground "storage" structures How Is Food Digested in Man? The Human Food Tube^ The mouth is the begin
. Biology and man. Biology; Human beings. CARBOHYDRATES BY NIGHT AND BY DAY In daylight, photosynthesis normally produces sugar faster than it can diffuse out of the cells and move into growing tissues or into underground ports. Surplus sugar in the leaves, and the sugar brought from the leaves into underground structures, become converted into starch. In the dark the starch that has accumulated in the leaves becomes transformed into sugar, which is carried into tubers or other under- ground "storage" structures How Is Food Digested in Man? The Human Food Tube^ The mouth is the beginning of a long tube inside of which all the digestion takes place. This tube is called the ali- mentary canal, or food tube. It consists of several fairly distinct regions. It is ten or eleven yards long and is coiled or twisted in parts (see illustra- tion, p. 167). In the mouth, food is crushed and ground by the teeth. The taste of the food, the movement of the jaws, and the rubbing of the food against the inside of the mouth stimulate the saliva glands. As a result, a quantity of saliva flows into the mouth and becomes mixed with the food. An enzyme 1 See No. 4, p. 183. 165. 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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