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Artificial Hearts 527

Fig. 2 Short-term pressure regulation. (Based on Orme, F., 2002. Human Physiology—
Lecture Notes. http://members.aol.com/Bio50/index.html (Retrieved September 2008).)

from which nerves convey the information to the nucleus tractus solitarius of
the medulla oblongata, in the brain. Feedback is provided via the vagus
nerve that slows the heart, and the accelerator nerve that speeds it up
(Orme, 2002).
Long-term regulation is determined mostly by the kidneys as they reg-
ulate salt and water content in the body, and these control BP. Sodium