Structure And Functions of the Body a Hand book of Anatomy And Physiology for N
Structure And Functions of the Body a Hand book of Anatomy And Physiology for N
Annette Fiske
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When the dilators are stimulated the opposite effect is produced: 1. The flow through the vessel is increased; 2. There is decreased arterial pres- sure, and 3. There is decreased flow through the other arteries. The palor of fright is due to the action of the vasoconstrictor nerves of the face and blushing to the action of the vasodilators. Heat stimulates the vasodilators so that more blood goes to the skin, perspiration begins, and the body is cooled by evapo- ration. Cold stimulates the vas...oconstrictors and the blood is kept within the body, where it cannot cool. If a part has too much blood, an impulse passes by the vasoconstrictors to lessen the supply, while if more blood is needed a message goes to the central ner- 116 THE HEART AND CIRCULATION. vous system and an impulse passes by the vasodilators to flush the organ. The more active a part is in func- tioning the greater the number of capillaries, except in the brain, which has only large vessels. The vessels of the intestines contain much blood and are capable of containing all the blood in the body.
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