Movie: Digestive System

Food doesn't need gravity to get to your stomach.

Human Body Systems – Functions, locations, anatomy, definition, picture
Results Biopsy specimens are sent to a pathology laboratory and examined under a microscope for changes that indicate a bacterial or parasitic infection or another abnormality. In either event, pregnancy complicates their problems because the gastrointestinal disturbances that often…. Stool, or waste left over from the digestive process, is passed through the colon by means of peristalsis contractions , first in a liquid state and ultimately in solid form as the water is removed from the stool. The stomach is an integral part of the digestive system, but it's not the same in all animals. The multi cellular salaivary glands are four pairs. Stained shirt photo via Shutterstock.

What is the digestive system?

Human digestive system

Thus comminuted it is known as "chyme," and passes through the pylorus into the small intestine, in the first loop of which, the "duodenum," it is mixed with the bile and pancreatic juice, these two fluids being the secretions of the liver and the pancreas. Their principal action is to convert its soluble parts into "peptones", which are to be conveyed into the Lymphatic System, and so into the Blood. Their absorption as chyle is effected by numerous "villi" or projections which line the walls of the whole Canal from the pylorus to the cloaca.

At the beginning of the rectum the caeca, when such are functional, receive the remaining chyme, and it is probable that in them certain hitherto undissolved matter, as cellulose and possibly chitin, is acted upon by methane, so as to extract as much nutrition as possible from the food. After remaining a due time in the caeca, their contents return to the retum, and are finally ejected through the cloaca as faeces.

The tunica serosa or adventitia, which is outermost and consists of partly elastic connective tissue. If you've ever drunk something too fast, started to cough, and heard someone say that your drink "went down the wrong way," the person meant that it went down your windpipe by mistake.

This happens when the epiglottis doesn't have enough time to flop down, and you cough involuntarily without thinking about it to clear your windpipe. Once food has entered the esophagus, it doesn't just drop right into your stomach.

Instead, muscles in the walls of the esophagus move in a wavy way to slowly squeeze the food through the esophagus. This takes about 2 or 3 seconds. Your stomach, which is attached to the end of the esophagus, is a stretchy sack shaped like the letter J.

It has three important jobs:. The stomach is like a mixer, churning and mashing together all the small balls of food that came down the esophagus into smaller and smaller pieces. It does this with help from the strong muscles in the walls of the stomach and gastric say: GAS-trik juices that also come from the stomach's walls. In addition to breaking down food, gastric juices also help kill bacteria that might be in the eaten food.

The small intestine say: If you stretched out an adult's small intestine, it would be about 22 feet long 6. The small intestine breaks down the food mixture even more so your body can absorb all the vitamins, minerals, proteins, carbohydrates , and fats. PAN-kree-uss , liver, and gallbladder. Those organs send different juices to the first part of the small intestine. These juices help to digest food and allow the body to absorb nutrients.

The pancreas makes juices that help the body digest fats and protein. A juice from the liver called bile helps to absorb fats into the bloodstream. And the gallbladder serves as a warehouse for bile, storing it until the body needs it. Your food may spend as long as 4 hours in the small intestine and will become a very thin, watery mixture.

It's time well spent because, at the end of the journey, the nutrients from your pizza, orange, and milk can pass from the intestine into the blood. Once in the blood, your body is closer to benefiting from the complex carbohydrates in the pizza crust, the vitamin C in your orange, the protein in the chicken, and the calcium in your milk. Next stop for these nutrients: The doctor inserts the lubricated capsule and tube into your throat and then asks you to flex your neck and swallow to aid in the advancement of the tube down through your esophagus.

You will not be able to speak when the tube is inserted, but your breathing will not be affected. Next, you will lie on your right side as the doctor advances the capsule and tube into your stomach, through the pylorus the opening of the stomach into the small intestine , and finally into the small intestine.

Continuous x-ray imaging, or fluoroscopy, is used to guide the progress and positioning of the device. To obtain the biopsy sample, a syringe is attached to the outer end of the tube and suction is applied. The suction draws a small piece of tissue into the capsule and then closes off the capsule, which cuts off the tissue from the intestinal lining.

The tube is slowly withdrawn, and the tissue sample is sent to a laboratory for analysis. The procedure lasts 45 to 60 minutes. When performed by a skilled professional, small bowel biopsy is typically safe and well-tolerated. Rare but serious complications of this procedure include bleeding, blood infection, and perforation of the bowel which requires surgical repair. You may leave the testing facility promptly after the test is completed. Do not eat or drink anything until your gag reflex returns, usually in a few hours.

Touching the back of the throat with a tongue depressor tests for this reflex. You may have black, tarry stools due to bleeding for a short period of time.

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