. Advanced biology. Biology; Physiology; Reproduction. CHAPTER XXII THE NERVOUS SYSTEM. Mimosa, a sensitive plant. A leaf that catches flies. How are plants and animals adjusted to their environments f What is the structure of the brain f What are the functions of the brain f Is phrenology a science f What scientific studies have been made of the nervous system f Irritability. Plants and animals must adjust themselves to their environment in order to survive. Different conditions in the environment provoke responses in organisms. Certain of the re- sponses of the amoeba were considered in the
. Advanced biology. Biology; Physiology; Reproduction. CHAPTER XXII THE NERVOUS SYSTEM. Mimosa, a sensitive plant. A leaf that catches flies. How are plants and animals adjusted to their environments f What is the structure of the brain f What are the functions of the brain f Is phrenology a science f What scientific studies have been made of the nervous system f Irritability. Plants and animals must adjust themselves to their environment in order to survive. Different conditions in the environment provoke responses in organisms. Certain of the re- sponses of the amoeba were considered in the discussion on the functions of the amoeba. If the response is very definite and with- out exception for a given stimulus, that response is known as a tropism. Such responses are characteristic of plants and of ani- mals without a nervous system. In animals with a nervous sys- tem, if the response is definite, mechanical, and without excep- tion, the reaction may still be called a tropism. For example, the swarming of the bees, the fluttering of moths around a light, and the burrowing of worms into the earth are frequently called tropisms. When an animal has a well-developed nervous sys- tem, the responses are more varied and individual. The nervous system governs and regulates the responses to stimuli. In this latter case the response is called a nervous reaction instead of a tropism. The response of the organism, whether it is a nervous reaction or a tropism, is due to the activity of the protoplasm in the 202. 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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