Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] A, isolated taste bud, from whose upper free end project the ends of the taste cells; S, supporting or protecting cell; C, sensory cell. -Wall easily found on your own tongue if a drop of vinegar is placed on its broad surface. In the folds, between these projections on the top and back part of the tongue, are lo- cated the organs of taste. These organs are called taste buds. Each taste bud consists of a collection of spindle- shape
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] A, isolated taste bud, from whose upper free end project the ends of the taste cells; S, supporting or protecting cell; C, sensory cell. -Wall easily found on your own tongue if a drop of vinegar is placed on its broad surface. In the folds, between these projections on the top and back part of the tongue, are lo- cated the organs of taste. These organs are called taste buds. Each taste bud consists of a collection of spindle- shaped nerve cells, each cell tipped at its outer en'd with a hairlike projection. These cells send inward fibers which ultimately reach the brain. The sensory cells are surrounded by a number of protecting cells which are arranged in layers about them. Thus the organ in longitudinal section looks somewhat like an onion cut lengthwise. How we Taste. —Four kinds of substances may be distinguished by the sense of taste. These are sweet, sour, bitter, and salt. Certain taste cells lo- cated near the back of the tongue are stimulated only by a bitter taste. Sweet substances are per- ceived by cells near the tip of the tongue. A substance must be dissolved in fluid in order to be tasted. Many things which we believe we taste, are in reality perceived by the sense of smell. Such are spicy sauces and flavors of meats and vegetables. This may easily be proved by holding the nose and chewing, with closed eyes, several different substances, such as an apple, an onion, and a raw potato. Smell. — The sense of smell is located in the membrane lining the upper part of the nose. Here are found a large number of rod-shaped cells which are connected with the forebrain by means of the olfactory nerv^e. In order to perceive odors, it is necessary to have them diffused in the air; hence we sniff or draw in more air over the olfactory cells so as to bring more odoriferous particles to them and thus
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