. Biology and human life. Biology. THE EMOTION'S 253 connect with the cortex of the brain, we become aware, or conscious, of peculiar feel- ings, or sensations (see Chap- ter XXIII). Some of these we recognize as hot, sweet, green, buzz, and so on. But most of the stimuli and re- actions of the autonomic sys- tem are entirely unconscious. We are not aware of a slight change in the chemical con- dition of the blood, such as an increase in the amount of carbon dioxid (see page 173). We are ordinarily not aware of the action of the liver and the kidneys, of the stom- ach and the small intestine.
. Biology and human life. Biology. THE EMOTION'S 253 connect with the cortex of the brain, we become aware, or conscious, of peculiar feel- ings, or sensations (see Chap- ter XXIII). Some of these we recognize as hot, sweet, green, buzz, and so on. But most of the stimuli and re- actions of the autonomic sys- tem are entirely unconscious. We are not aware of a slight change in the chemical con- dition of the blood, such as an increase in the amount of carbon dioxid (see page 173). We are ordinarily not aware of the action of the liver and the kidneys, of the stom- ach and the small intestine. Sometimes, however, we do become aware of internal events, and usually in an un- pleasant way. After a person has gone without food for a long time, he may have pangs of hunger, which are con- nected with violent contrac- tions of the stomach. When the liver is out of order, one may feel grouchy, irritable, or pessimistic. The feelings that we have when disturbances of the autonomic system come to consciousness are called emo- tions. They differ from sen-. Inlesline Fig. 120. The autonomic nervous system In front of each vertebra is a pair of gan- glia, gg, which are connected (i) with each other: (2) with the spinal nerves, ; and (3) with the organs of digestion, circula- tion, elimination and leproduction, and the glands. The middle portion of this system, regulating the organs in the thoracic and lumbar regions, is sometimes called Xht sym- pathetic nervous system. Through these nerves the unconscious and involuntary proc- esses are connected with the voluntary and conscious ones. 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. Boston, New York [etc. ] Ginn and Company
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