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( Stomach) In human anatomy, the stomach is a J-shaped hollow muscular organ of the gastrointestinal tract involved in the second phase of digestion, following mastication. The word stomach is derived from the Latin stomachus,^[3] which derives from the Greek word stomachos (st?µa???). The words gastro- and gastric (meaning related to the stomach) are both derived from the Greek word gaster (?ast??).

For information about the stomach of cows, for example, see ruminants.

The three basic/main functions of the stomach are to kill any bacteria ingested, break down the food into smaller pieces to create a larger surface area for easier digestion, and to hold food and release it at a constant rate. The stomach is a highly acidic environment due to hydrochloric acid production and secretion which produces a luminal pH range usually between 1 and 2 depending on the species, food intake, time of the day, drug use, and other factors. Combined with digestive enzymes, such an environment is able to break down large molecules (such as from food) to smaller ones so that they can eventually be absorbed from the small intestine. A zymogen called pepsinogen is secreted by chief cells and turns into pepsin under low pH conditions and is a necessity in protein digestion.^[4]

The human stomach can produce and secrete about 2.2 to 3 liters of gastric acid per day with basal secretion levels being typically highest in the evening. The stomach can expand to hold between 2-4 liters of food. It is a temporary food storage area, and in the process of digestion, the food goes into the stomach first.

Stomach Subcategories Stomach Articles Top 5 Ways to Lose That Belly Fat by Jo Mark There are a number of ways of losing belly fat from your stomach. Belly fat can increase for a number of reasons. And there are a number of ways to get rid of it. Following, are the top 5 ways to get rid of that unsightly belly fat: Sit ups a... Top 5 Ways to Lose Stomach Weight by Brian Feeney It seems that nowadays every other week there is a new fad diet on the market for you to lose stomach weight. As you might suspect scientists or nutritionist have not found some magical weight loss method. To lose stomach weight there are numerous ... Burning Stomach Fat - How To Get Rid Of That Spare Tire by Dean James Burning stomach fat is one of the top desires of those seeking to lose weight. As the belly is one of the first places fat shows on most people, eliminating this fat can help make certain you are as healthy as possible. Below, you will find s... 5 Tips to Lose Weight Quick by Bryan Hufford Most of us are dissatisfied with our weight. No matter where we need to lose it, we always think that some parts (or all parts) of our bodies could use a little tune up. Some people want to lose stomach fat. Some want to lose arm fat. Some want to lo... Lose Tummy Fat - How to Melt That Stomach Fat Off Now by Bryan Hufford If you're looking to lose tummy fat, let me be the first to tell you that all of the sit ups and crunches in the world will be the last thing that will help you melt the fat off of your belly quick. The truth is they just don't burn fat like everyone... 5 Simple Nutrition Tips That Will Let You Lose Weight by The Ab Guy Six Pack Abs How can you make your grocery shopping trip most effective? Below are 5 tips that I promise if you follow closely you will experience more success in eating healthy. Everybody knows that flat abs start in the kitchen. Most people know that sadly a fa... How To Lose Stomach Fat With No Gym by Leong Tony How to lose stomach fat and at the same time gain muscles is a real mystery. Many people get the advice of joining the gym and try different heavy workouts. In the process you may get frustrated as the style may not work for you. There is a chance th... Fat Loss Workouts: What They Fail To Tell You by Todd Scott There are tons of different workouts for burning blubber, the most popular and the most effective for fat loss are full body workouts or workouts containing exercises that stimulate the large muscle groups. There are 2 different interpretati... Burn Belly Fat Faster than Ever with these 3 Tips by The Ab Guy Six Pack Abs Losing weight is as simple as 1, 2, 3. As long as you consume fewer calories than your body is burning on a day-to-day basis you WILL lose weight. But it is very important to notate that losing weight does not necessarily mean that you will los... Ab Workouts and the Correct Way to Burn Excess Stomach Fat by gary nealon Have you ever seen that guy in the gym who spends 15-20 minutes just doing stomach crunchs or situps? One of the common misconceptions is that by doing a lot of ab exercises such as situps, will help you burn stomach fat. While ab workouts will ...