It is known as the Pavlovian effect. The ANS 'learns' to prepare your body systems for the coffee by making saliva and beginning stomach contractions in order to process the coffee and maybe the breakfast that will soon follow.
The main chemical activity of the stomach is digestion of the proteins. There are a number of enzymes and hormones secreted in the stomach to aid this process.
A gas is evolved as a product of a chemical reaction.
Neutralization reaction
The stomach produces hydrochloric acid to aid digestion
I suppose that the reaction between fruit/vegetables juices and hydrochloric acid from the stomach are not so important. Juices can increase the acidity in stomach.
He had stomach cancer.
That might explain her stomach, but what would explain the reason for the enlarged rear end?
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No. The autonomic nervous system is responsible for controlling the muscle activity of your stomach.
breathing blood pumping brain activity stomach activity kidney and liver activity
Because the antacid neutralizes the the HCl in the stomach (or at least in excess amount) to produce water and a salt, and it is good example of neutralization reaction.
Yes, it is a chemical reaction usually known as decomposition