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Physical and Chemical Changes That Occur

Throughout the Digestive System

While mastication occurs, its a physical change. The food is then moistened with saliva creating a soft mass called a bolus right after it is passed down to the esophagus. This is a chemical change.

When the substance is passed down to the esophagus, its still a physical change because the only change that's happening is that the food is going down by the process of contractions that is caused by gravity.

When the substance lands on the stomach, many changes happen. First the substance is crushed and while this happens, hydrochloric and pancreatic acids jump on the food to dissolve it and dissolves it. This is a chemical change. After it is dissolved, it turns into a soapy liquid called chyme (pulpy acidic fluid that pass from the stomach onto the small intestine) and this is a chemical change.

Chyme

Pancreas- sends pancreatic juices into the small intestine.

The small intestine is joined with the large intestine throughout the lower part of the abdomen where the substance that couldn't be digested, turns into feces. This process is a chemical change. Feces is achieved by absorbing the water, nutrients and salt of the remaining part of the chyme. Getting rid of residue (a small part of something huge), this is a chemical change. Once the water is all absorbed, whats left is known as feces. Feces consists of nondigested food. This is a chemical change.

Then the chyme goes to the small intestine through a sphincter that connects the small intestine and the stomach. Then the carbohydrates, protein, fats, minerals and vitamins are extracted, which is a chemical change. The nutrients are carried all over the circulatory system where they are dropped for cells that need them; this is a physical change because the nutrients remain the same. Waste is then collected from the cells and brought down to the small intestine where it is passed down to the large intestine. Fat that has not been dissolved in the small intestine is then dissolved by bile (helps to absorb the fat that is left and then it is stored and concentrated in the gallbladder) This is a chemical change.

Feces is then stored in the rectum after passing all over through the large intestine where it can be passed out through the buttocks completing the digestive system. This is a physical change.

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