sulfur and barium
Patients drink what is known as a contrast solution so doctors can view the patients digestive tract. The contrast solution shows abnormalities within a CT scan or MRI that can not normally be seen without contrast.
An endoscope is used to view the stomach and esophagus through a procedure called an endoscopy. It is a flexible tube with a light and camera on the end that is inserted through the mouth and into the digestive tract to provide internal images for diagnosis and treatment.
composition view
The simple view can be used to insert various things. The slide show is able to test these elements.
View the following related links for a couple example of a cow's digestive system.
Subjective
Composition View :)
Yes it is. If it gets in your food and you ingest it, it will just pass through your digestive tract without any toxic effects. It's not absorbable. However, it is recommended that you buy new pots and pans as soon as possible (speaking from a wear-and-tear point of view).
Endoscopes are used within the field of medicine, specifically in the examination of the colon, bladder or stomach. They are thin flexible tubes, which use a lens or tiny camera to view the gastrointestinal tract.
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The hydra has a single opening digestive tract so what goes in has to come out the same way. Worms have two openings to their digestive tract so things can just go straight through without any stopping. This is an interesting - if rather standard - exam question. Looked at from an evolutionary point of view it is clear that the gut structure present in the earthworm offers far more potential than the hydra's simple 'gutbucket'and has, (unlike the latter) been exploited along the length of the evolutionary path starting from the point after hydra. The questions that follow from this include how did the gut structure evolve, what competitive advantage does it offer and, most important of all, why. Jon P Baker, Sheffield, England
Normally "no carbonated drinks" (sometimes coupled with "clear fluids only") is a rule generally used for the day before surgery which specifically needs a clear view of the digestive system, such as an endoscopy. Carbonation or opaque fluids would obscure the view.