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9 Cards in this Set
- Front
- Back
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What is the stomach? |
The stomach is a muscular sac that expands with the food eaten. The stomach wall is constantly contracting and relaxing to churn its contents. |
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What does the churning do? |
Helps to break up food particles and to mix them with gastric juice to form a fluid called a chyme. |
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What is gastric juice? |
A digestive juice produced by gastric glands in the wall of the stomach. It contains hydrochloric acid, mucus, and the enzymes rennin and pepsin. |
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What does the hydrochloric acid do? |
Provide a strong acid environment with a pH 1-2. The hydrochloric acid activates the enzyme pepsin and rennin it creates the best environment for them, it kills any bacteria entering the stomach and it deactivates the enzyme salivary amylase. |
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What does mucus do? |
Lubricates food and protects the stomach wall from the acid and enzyme action. |
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What does rennin do? |
Work in babies causing milk protein to clot and remain in the stomach to be acted on by the pepsin enzyme. |
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What does pepsin do? |
Breaks down protein into polypeptides. |
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How long does food remain in the stomach? |
4 hours. A meal of carbohydrates only would take less time than one with fats and protein. |
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What does the pyloric sphincter do? |
It connects the stomach to the duodenum and controls the rate at which chime exits the stomach. |
