Hering-Breuer Reflexes

respiratory reflexes that arise during inhalation and exhalation; an essential element in respiratory self-regulation. The reflexes were described by the German physiologists E. Hering and J. Breuer in 1868. During inhalation the lungs expand, causing stimulation of the mechanoreceptors in the alveoli and in the intercostal muscles and the diaphragm, which are sensitive to mechanical stimulation of nerve endings. From the mechanoreceptors the nerve impulses travel along the vagus nerve, enter the respiratory center of the medulla oblongata, and cause excitation of the neurons, leading to relaxation of the muscles and exhalation. The greater the lung expansion, the more nerve impulses enter the respiratory center, leading to cessation of inhalation and initiation of exhalation. Cessation of these impulses again stimulates inhalation.

Hering-Breuer reflexes

[her´ing broy´er] inflation and deflation reflexes that help regulate the rhythmic ventilation of the lungs, thereby preventing overdistention and extreme deflation. These reflexes arise outside the center" >respiratory center in the brain; that is, the receptor sites are located in the respiratory tract, mainly in the bronchi and bronchioles. They are activated by either a stretching or a non-stretching and compression of the lung; the impulses are transmitted from the receptor sites through the vagus nerve to the brainstem and thence to the respiratory center.
The inflation reflex acts to inhibit inhalation and thereby prevent further inflation. When the lung tissue is stretched by inflation, the stretch receptors respond by sending impulses to the respiratory center, which in turn slows down the rate of inhalations. As the expiratory phase begins, the receptors are no longer stretched, impulses are no longer sent, and inhalation can begin again. This is called the Hering-Breuer deflation reflex. Besides cessation of impulses from stretch receptors, there may also be an activation of compression receptors that transmit impulses that inhibit exhalation, thus allowing inhalation to begin.

单词	hering-breuer reflexes
释义	Hering-Breuer Reflexes Hering-Breuer Reflexes respiratory reflexes that arise during inhalation and exhalation; an essential element in respiratory self-regulation. The reflexes were described by the German physiologists E. Hering and J. Breuer in 1868. During inhalation the lungs expand, causing stimulation of the mechanoreceptors in the alveoli and in the intercostal muscles and the diaphragm, which are sensitive to mechanical stimulation of nerve endings. From the mechanoreceptors the nerve impulses travel along the vagus nerve, enter the respiratory center of the medulla oblongata, and cause excitation of the neurons, leading to relaxation of the muscles and exhalation. The greater the lung expansion, the more nerve impulses enter the respiratory center, leading to cessation of inhalation and initiation of exhalation. Cessation of these impulses again stimulates inhalation. Hering-Breuer reflexes Hering-Breuer reflexes [her´ing broy´er] inflation and deflation reflexes that help regulate the rhythmic ventilation of the lungs, thereby preventing overdistention and extreme deflation. These reflexes arise outside the center" >respiratory center in the brain; that is, the receptor sites are located in the respiratory tract, mainly in the bronchi and bronchioles. They are activated by either a stretching or a non-stretching and compression of the lung; the impulses are transmitted from the receptor sites through the vagus nerve to the brainstem and thence to the respiratory center. The inflation reflex acts to inhibit inhalation and thereby prevent further inflation. When the lung tissue is stretched by inflation, the stretch receptors respond by sending impulses to the respiratory center, which in turn slows down the rate of inhalations. As the expiratory phase begins, the receptors are no longer stretched, impulses are no longer sent, and inhalation can begin again. This is called the Hering-Breuer deflation reflex. Besides cessation of impulses from stretch receptors, there may also be an activation of compression receptors that transmit impulses that inhibit exhalation, thus allowing inhalation to begin.
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