Ruktus
As eructation (also Ruktation , Eflation , belching , burping refers to the delivery of) stomach air or the bark of in the rumen accumulating fermentation gases.
This reflex , which is a kind of “ burping ”, is triggered by the tenth cranial nerve , the vagus nerve . The gas (60% carbon dioxide , 40% methane ) is transported to the reflex opening of the esophagus through a contraction of the rumen sac on the back during a B cycle of the rumen motor skills . From there it reaches the throat via anti- peristalsis in the esophagus . Since the soft palate closes the way into the oral cavity during this process and the mouth is also closed, the gas first enters the lungs . Here the carbon dioxide is partially absorbed , thereby due to the increase of the CO 2 - partial pressure in the blood faster breathing movements is triggered a sequence through which the carbon dioxide is finally exhaled. A rupture occurs about twice a minute, with an adult domestic cattle releasing about 200 liters of rumen gases daily.
literature
- Engelhardt, W. v. and G. Breves (ed.): Physiology of domestic animals. 15. Physiology of the gastrointestinal tract . Enke-Verlag, Stuttgart, 2nd edition 2000, pp. 313-422, ISBN 3-8304-1039-5 .
- Pschyrembel , 257th edition, Walter de Gruyter, Berlin / New York 1994, p. 1351