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The Digestion Story
Transcript of The Digestion Story
The next organ in the journey is the small intestine. Ingestion is the first step of the digestive system. Ingestion is when the food in chewed and broken down by the mouth. It is broken down chemically by saliva, or salivary amylase, and the food is broken down mechanically when the mouth chews it with the teeth.
Then the food is swallowed and becomes a bolus in the esophagus where it is squeezed by muscle contractions, this is called peristalsis. Once through the esophagus it will go into the stomach. The Digestive System The Pizza Adventure The adventure starts with the pizza being made and topped with all the delicious, mouth watering toppings. Once this pizza is delivered to the table it will go through the entire digestive system. It will be quite a journey! The enzyme pancreatic amylase breaks down starches into carbohydrates.
Trypsin breaks down proteins
Lipase breaks down fats
Enzymes maltase, sucrase, and lactase break down the rest of the disaccharides into monosaccharides
To finish the digestion process peptidase breaks down the dipeptides into amino acids. ENZYMES ABSORPTION The nutrients are now in their simplest forms. They are absorbed into the bloodstream through the small intestine wall, which is lined with tons of finger-like extensions called villi.
Once in the bloodstream the nutrients are carried to the liver to be checked and examined before being spread to the entire body.
The nutrients are absorbed until there isn't any left. Absorption (Blood) Once the nutrients are in the blood, through the process of Absorption, they are transported to the liver to be screened. They are examined by the liver to make sure that they are clean and going to be helpful for the body. If they are cleared by the liver they will maintain in the bloodstream and will be transported throughout all the organs and then to the rest of the body. The food is ingested and chewed by the mouth.
The salivary amylase, or saliva, breaks down the starches into disaccharides.
The teeth break the food into smaller pieces that are easier to swallow and digest. The enzyme pepsin starts to break down the proteins within the food.
The slow churning motion of the stomach breaks down the food until it becomes a liquid form called chyme. This is the esophagus. The bolus moves down it while being squeezed by muscle contractions through the process of peristalsis,
Once through the esophagus the bolus lands in the stomach. Stomach Liver, Gallbladder, and Pancreas The liver has a very important job in the process of digestion. The liver processes waste and nutrients, and decides on whether to get rid of it through elimination or put it into the bloodstream to spread throughout the whole body.
The gallbladder provides bile in the small intestine to help break down fat molecules.
The pancreas releases a base called sodium bicarbonate to neutralize the acidic level of the food/chyme that has been moved into the small intestine. The pancreas also produces pancreatic amylase, trypsin, and lipase which all break down specific nutrients (which i talked about in the small intestine frame). The enzyme bile is produced in the liver. It is later passed to the gallbladder to be used in the process of digestion.
Bile is full of salts and lipids, and it helps lipase in the process of breaking down large fat molecules.
The pancreas also produces enzymes that help break down individual nutrients.
Elimination (Large Intestine) The process of elimination begins in the large intestine. The large intestine absorbs all the left over water in the waste so that the body can use it.
The waste, or the undigested material, moves through the large intestine until is it completely dry of water and it is ready to be excreted out of the body.
All water is absorbed and stored in the body.
All undigested material keeps moving through the intestine
Elimination (first step) Elimination (excretion) Once all the water is absorbed out of the waste and the waste is near the end of the large intestine, it is ready to be excreted.
The undigested material is excreted out the rectum/anus. THE END That is the end of the journey for now. Next time the human eats, the process will restart and repeat.