Our Digestive System
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Without the digestive system, there would be no way to process the nutrients (proteins, glucose, vitamins...) in food and get the waste out of the body. Without all the enzymes found in the body and the different organs to break down the food that is eaten into vital components which our body uses to function. Once the food is eaten and chewed, then passes by the stomach where it is churned, it passes through the intestines where nutrients enter the blood stream. They are then brought to the cells and through diffusion, nutrients move from the highly nutrient-concentrated blood cell to the low concentration cell in need of carbohydrates, lipids and proteins. Cellular respiration takes place within the cell in the mitochondria. There, nutrients (glucose mainly) is then turned into energy called ATP which are three phosphate groups. They have a lot of potential energy and when one breaks off from the chain, the cell gets energy!
Radiated Tortoise Digestive System
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A tortoise's digestive system has some similarities to us however it can absorb more nutrients from a certain food than any other organism and it has no teeth! Once the food is eaten and passes the mouth, it still has not been chewed or broken down in anyway. That happens in the stomach where the food is churned and highly powerful enzymes break down the food into small molecules. Other than that, the only difference between the human and the tortoise's digestive system is that they're body is able to recognize and absorb every last bit of nutrients from a certain food that, if another organism ate it, their body would just count it as waste. The rest (the intestines and the anus) are the same as humans. The small intestine is for nutrition absorption and the large intestine is for water absorption.