. Advanced biology. Biology; Physiology; Reproduction. AXON rons is commonly known as a synapse. The sense organs, known as receptors, receive the stimulus which starts the nerve current. The ends of the nerve fibers of these organs are on the outside (skin) of the body. The muscles or glands are called effectors because they bring about activity. An axon that connects with a sense organ is called an in-going, sensory, or afferent axon; one that connects with a muscle or gland is an out- going motor, or efferent axon. The neurons possessing these axons mav be either sensorv or motor neurons. F
. Advanced biology. Biology; Physiology; Reproduction. AXON rons is commonly known as a synapse. The sense organs, known as receptors, receive the stimulus which starts the nerve current. The ends of the nerve fibers of these organs are on the outside (skin) of the body. The muscles or glands are called effectors because they bring about activity. An axon that connects with a sense organ is called an in-going, sensory, or afferent axon; one that connects with a muscle or gland is an out- going motor, or efferent axon. The neurons possessing these axons mav be either sensorv or motor neurons. For ex- ample, when the finger is placed on a hot object and immediately withdrawn, a series of actions has taken place in the nervous system. The nerve fiber in the finger re- ceived a stimulus which it carried to the brain. The brain in turn sent out a message to the muscles in the arm and hand, so that the finger was immediately removed from the object. When neurons connect sensory with motor neurons, they are called associative neurons. Groups of nerve cells situated outside. terminoi branch The unit of structure of the nervous system is the nerve cell or neuron. The control of all activities in the entire body is maintained by these 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 Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Book Company
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