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The stomach is a muscular sack that processes food.
The stomach is a muscular sack that processes food.
Stomach Acid:
Stomach Acid:
The environment of the stomach is very acidic (~pH 2). This is because the stomach produces gastric acid, which helps to break and dissolve solid food chunks into liquid slush.
Stomach Churning:
Stomach Churning:
The stomach is a muscle. As it contracts (by peristalsis), it helps to churn and mix food with the acid to create a liquid slush called chyme.
Stomach churning is an example of mechanical digestion!!!
Stomach Enzymes:
Stomach Enzymes:
The stomach contains specific enzymes that start the digestion of proteins. These enzymes work best in a very acidic environment.
NOTE: The enzymes from the mouth that travel to the stomach with the chewed food denature in the stomach- this environment is too acidic for enzymes produced by the mouth!
Chemical digestion in the stomach: SPECIFIC ENZYMES begin the digestion of proteins.
Chemical digestion in the stomach: SPECIFIC ENZYMES begin the digestion of proteins.
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NOTE: A "protease" is any enzyme that catalyzes the break down of proteins. Pepsin is the name of the specific protease in the stomach.
NOTE: A "protease" is any enzyme that catalyzes the break down of proteins. Pepsin is the name of the specific protease in the stomach.
Pepsin is a protease that only functions in an acidic environment.
Pepsin is a protease that only functions in an acidic environment.
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