So here\'s your assignment. Imagine you\'ve just taken a healthy bite of a nice,

Question

So here's your assignment. Imagine you've just taken a healthy bite of a nice, juicy burger. What happens to the parts of that burger as it travels through your body, from one end to the other?

Your assignment will focus on those big three nutrients--protein, carbohydrate and lipid. In your assignment, you are to discuss what happens to these various components (beginning with the intact bite of burger) as they travel through the mouth, esophagus, stomach, duodenum and small intestines, and the colon. Don't forget what happens at the very end ;^) Along the way, some adjunct structures come into play as well. Don't forget about the salivary glands, the liver, the gall bladder and the pancreas. Also, you need to include specific information about digestive enzymes, including names and sources, and the target molecules they act upon. A strong hint: The smartest way to go about this is to treat each of these "way stations" in order. Start with the mouth, then follow the food as it passes from one area of the digestive system to another. Keep your narrative organized and easy to follow. And have fun--this is your burger you're talking about ;^)

Explanation / Answer

Burger is made of Bread, butter, some sandwitched veg/non-veg stuff. Bread contains carbohydrate, butter contains fat or lipid and sandwitched items contain mostly protein.

As this burger enters into our digestive tract, the digestive juices at various parts of this digestive tract act on these carbohydrates, proteins and lipids and digest them gradually.

The digestion starts at buccal cavity or oral cavity. Inside the buccal cavity from salivary glands 'saliva' is secreted. Saliva contains salivary amylase or Ptyalin, which acts on the carbohydrate portion of the Burger and partially digest the carbohydrate.

From the buccal cavity through Pharynx the Burger enters into the esophagus. Through esophagus Burger enters into the stomach, where it stays around 4 hours. In the walls of stomach, gastric glands are there, from which gastric juice is secreted. in the gastric juice 'HCl, pepsin and mucus' are present. HCl makes the food acidified. in this acidified food on the proteins the pepsin will act and partially digest the protein component of the food in the stomach.

From the stomach after 4-5 hours of stay the Burger will leave and enters the small intestine. At the start of the sm

all intestine from the liver 'bile juice' and from the Pancreas 'Pancreatic juice' are released through their common passage, hepato-pancreatic duct.

bile juice contains bile salts in it. these bile salts converts acidified Burger into alkaline condition. Then pancreatic juice trypsin acts on proteins and pancreatic lipase acts on emulsified fats. emulsification of fats before pancreatic lipase's action is carried out by bile salts.

Into the small intestine, from the walls of the small intestine itself, intestinal juice or 'succus entericus' is secreted. Succus entericus contains final digestive enzymes such as 'Carbohydrases, Proteases, Lipases, Nucleases' etc. all these enzymes together they carryout the digestion finally.

Then from the small intestinal microvilli the final digested Burger components are absorbed and later they are assimilated.

The undigested Buger, will be egested out through rectum via anus.

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