What is the first part of the digestive system?
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Your mouth!!!\n\nDigestion begins in the mouth!!!
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Digestion system depends upon your daily life style and food pattern. \n1. You may drink a glass of water before going fresh. If you don't do that, that do 2.\n2. In Morning,After having teethbrush, Take a glass of lemon water with excess salt. (half lemon, one teaspoon salt in a glass of water).Wait for 10-15 minutes. You will be called.\n3. You should do some stomach excercise. You may do yoga, especially kapalbhati is very useful for digestion.\n4. You should go for morning walk or take a small run.\n5. Care what you eat in breakfast.Neither miss breakfast nor  combine it with lunch. Over-eating habit as well as empty stomach both lead to bad digestion.  \n6. Dinner should be lighter than lunch.and After dinner, GO FOR A WALK before going to bed.\n7. State of your mind also matters. If your are stressed, depressed or worried, your digestion system may be disturbed.\n8. Increase the intake of fiber / digestive enzymes.You may take one apple daily in breakfast.\n9. Decrease intake of much oily & spicy food & meat.\n10. Don't take cold water, coffee/tea with meal.\n11. Read also me http://altmedicine.about.com/od/optimumhealthessentials/a/Tips_Digestion.htm\n\nBest of luck.
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The first liver in a living thing.
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It produces enzymes that are released into the small intestine to help with digestion. It also contains clusters of cells called islets. The cells in these islets produce hormones such as insulin and glucagon, which help control the level of glucose (a type of sugar) in the blood.
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gastro intestinal tract
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The small intestine is a long, narrow, coiled tube extending from the stomach to the large intestine. This is the place where most digestion and absorption of food takes place. The small intestine of a human can be as long as six to eight meters long (20-26 feet), depending on age and size of being. So much length can be compacted into so little space because of the nature of the small intestine; it is coiled and takes up less space, while maintaining it's enormous surface area.\n\nThe large intestine is the posterior or end of the human intestine that consists of four regions the, the cecum, the colon, the rectum and the anal canal. The large intestine is wider but shorter than the small intestine. It measures approximately 1.5 meters (5 feet) in length and its primary function is to absorb water and electrolytes that have already passed unabsorbed through the small intestine.\n\nTogether - the intestines range in length anywhere from 25 - 31 feet.
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It's given the same name the first part of your small intestine is: The duodenum.
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The small intestine is about 6 meters (20 feet) long. It is coiled in the center of the abdominal cavity (see picture). The small intestine is divided into 3 sections: upper, jejunum, and ileum. The lining of the small intestine secretes a hormone called secretin, which stimulates the pancreas to produce digestive enzymes.
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Mouth, stomach, intestines.
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Here is a good article for you - http://en.wikipedia.org/wiki/Digestive_system.
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The esophagus is just the path by which food travels from the mouth to the stomach. No digestion occurs within it. The movement of food is aided by muscle contractions called peristalsis, which works the food down to the stomach for further digestion.
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The alimentary canal, or the digestive tract as it is most commonly known, is 9 meters (about 30 feet) from the esophagus to the an*s.  http://hypertextbook.com/facts/2001/AnnaTaran.shtml
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I'm guessing that you mean Paramecium, a single-celled organism?  Biochemically, metabolism would be the same as any one of our cells.  Digestion refers to breaking down food into nutrients that are then made available to individual cells.  Paramecium don't have a digestive tract though they do have an "oral groove."\n\nYou might want to ask this question over in zoology to get a biologist's more informed opinion.\n\nAloha
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If I am understanding this question correctly, we humans have one (Esophagus).  But it splits into two (Mouth and Nose).  Now Digestive gases... You know... Flatulence.
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Hint: endoderm forms most of the digestive system, as well as other important organs\nEctoderm forms the tegument and the nervous system.\nWhat do you have that's between them?
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There are more than three.  Esophagus, stomach, liver, gallbladder, pancreas, small intestines, large intestines...
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The portal venous system drains venous blood from the abdominal part of the digestive tract (except the lower rectum), spleen, pancreas, and gallbladder and delivers it to the liver.