A General Physiology for High Schools : Based Upon the Nervous System
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In our eReader you can find the full English version of the book. Read A General Physiology for High Schools : Based Upon the Nervous System Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A General Physiology for High Schools : Based Upon the Nervous System
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99).
244. Inhibitory Fibers of Cardiac Nerves. — Stimulation of the fibers of the motor branch of the vagus running to the heart not only does not increase its action, but retards or inhibits it, and may entirely stop its beating. By this means the brain keeps a continual check upon the action of the heart. It has been found that if the vagus nerves of a dog are divided, the beat of the heart is quickened.
245. Reflex Inhibition. — A violent blow upon the stom- ach or abdomen, as is well known,... may cause fainting, due to stoppage of the heart's action. The stimulus of the blow is carried by the sympathetic nerves of the epigas- tric plexus, situated around the pit of the stomach, to the thoracic ganglia and thence to the medulla oblongata.
There the impulse is reflected along the efferent fibers of the vagus to the heart muscles, and their action is checked. Fainting may be caused in a similar way by the action of severe pain or strong emotion upon the nerve cells of the brain. The impulse reaches the region of the medulla oblongata from which the vagus arises, and is sent on to the heart.
What to read after A General Physiology for High Schools : Based Upon the Nervous System?
You can find similar books in the "Read Also" column, or choose other free books by Macy, M. L. (Maude Little) to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
99).
244. Inhibitory Fibers of Cardiac Nerves. — Stimulation of the fibers of the motor branch of the vagus running to the heart not only does not increase its action, but retards or inhibits it, and may entirely stop its beating. By this means the brain keeps a continual check upon the action of the heart. It has been found that if the vagus nerves of a dog are divided, the beat of the heart is quickened.
245. Reflex Inhibition. — A violent blow upon the stom- ach or abdomen, as is well known,... may cause fainting, due to stoppage of the heart's action. The stimulus of the blow is carried by the sympathetic nerves of the epigas- tric plexus, situated around the pit of the stomach, to the thoracic ganglia and thence to the medulla oblongata.
There the impulse is reflected along the efferent fibers of the vagus to the heart muscles, and their action is checked. Fainting may be caused in a similar way by the action of severe pain or strong emotion upon the nerve cells of the brain. The impulse reaches the region of the medulla oblongata from which the vagus arises, and is sent on to the heart.
What to read after A General Physiology for High Schools : Based Upon the Nervous System?
You can find similar books in the "Read Also" column, or choose other free books by Macy, M. L. (Maude Little) to read onlineMoreLess
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