. Biology; the story of living things. BEING A WOIIM 195 going fibers which originate in nerve cells within the cord are known as efferent or motor fibers, since they end in muscle cells and stimulate them to contract, thus causing motion. The unit over which these impulses travel is called a neuron, which is the term given to the nerve cell and its prolongations. (See page 340.) In the earthworm sensory anterior- SerjSory c<=ll5{r<2cepto«) epidermis.':. â muscle cells ;e|^fecton$) ,^â \j â¢postsrior The nerve cord of the earthworm showing neurons concerned in the reflex arc. E
. Biology; the story of living things. BEING A WOIIM 195 going fibers which originate in nerve cells within the cord are known as efferent or motor fibers, since they end in muscle cells and stimulate them to contract, thus causing motion. The unit over which these impulses travel is called a neuron, which is the term given to the nerve cell and its prolongations. (See page 340.) In the earthworm sensory anterior- SerjSory c<=ll5{r<2cepto«) epidermis.':. â muscle cells ;e|^fecton$) ,^â \j â¢postsrior The nerve cord of the earthworm showing neurons concerned in the reflex arc. Explain how adjustment to an unfavorable condition might be affected. How might movement in another segment of the worm be co-ordinated with the one shown in the diagram.'' (After Curtis and Guthrie.) impulses are passed longitudinally, both anteriorly and posteriorly, by means of the peripheral nervous system, and these impulses are modified by means of adjustor neurons in the central nervous system. This accounts for the co-ordination between segments as the worm crawls toward a desirable object or suddenly withdraws from a harm- ful situation. The Reproductive System and Reproduction Earthworms have both testes and ovaries in the same animal, and are therefore hermaphroditic, but they are not capable of self- fertilization. Two pairs of testes lie attached to the anterior walls of. 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 Hunter, George W. (George William), 1873-1948; Walter, Herbert Eugene, b. 1867; Hunter, George W. (George William), 1902-. New York, Cincinnati [etc. ] American book company
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