As food passes through the digestive tract, digestion occurs in the order of ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation. In terms of the process that operates the steps of digestion, the human body performs four vital functions known as motility, digestion, absorption and secretion. As the mouth digests food, it chews and mixes with a chemical of carbohydrates. After that the food moves to the pharynx, and makes it into lipids. The pharynx takes food from the oral cavity and moves it to the esophagus.  The stomach mixes and churns food with gastric acids from the chyme, and it begins to break down the proteins. The stomach also absorbs fat-soluble substances like alcohol and aspirin. In the small intestine it pushes food slow enough where it can digest and absorb. Carbohydrates, proteins, lipids, and nucleic acids, along with vitamins are being absorbed by the small intestine.  The large intestine further breaks down the food and their residues. The access water, electrolytes, adn vitamins are also benign taken out by the large intestine. It pushes the rest of the food towards the rectum and eliminates the feces. The mucosa layer, is the innermost layer, and functions in absorption and is composed of epithelium cells and a thin connective tissue.

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  1. Negative feedback is when a system’s output acts in order to decrease or reduce the processes that may lead to the output of that particular system used.This would then result in an output that is less. It is a vital control that helps with maintaining the body’s homeostasis. Essentially, the mechanism of a negative feedback allows self-stabilization. The digestive system contains many key roles and as a whole, has negative feedback. Food passes through the digestive tract and continues in a specific order that includes ingestion, mechanical or physical digestion, absorption, as well as defecation. Along with these, there are four functions that are vital which are; motility, digestion, absorption, and secretion. Throughout these processes, there are multiple reactions involving different substances and chemicals to break down the food while also ones that are beneficial get absorbed. Eventually, what is left of the food would get pushed towards that rectum as it is eliminated as feces. Arusha created a very descriptive diagram of the digestive system. It shows each key component that is involved in this negative feedback system where we can trace the process of how food is digested and moves through our body starting at the oral cavity and ending at the rectum and anus. Everything is color coded with each label directly associated with the organ or part in the system which allows it to be more helpful and easy to understand for everyone who is learning about this incredible process. Based on the paper that she wrote, you can tell that she was able to accurately relay what we learned in class and put it in this project.

    Taylor Hasting

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