Help with the Alimentary canal?????

Question

Does anyone know what the main tissue groups are in the alimentary canal and their functions? Thank You x

Answer 1

`The Digestive System` - Digestion breaks down food into simpler substances so it can be used and absorbed into the body It takes place in the alimentary canal, (food tube), mainly in the stomach and small intestine Digested food is absorbed into the blood system
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Answer 2

The Alimentary canal - that joins up with the Grand Union canal doesn't it?! Why would there be tissue in a canal? Strange question.

Answer 3

The gastrointestinal tract or digestive tract, also referred to as the GI tract or the alimentary canal, (nourishment canal) or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and expels the remaining waste. This process is called digestion.

The GI tract differs substantially from animal to animal. For instance, some animals have multi-chambered stomachs.

Answer 4

it helps the food in reaching the stomach for digestion. Mainly there are epithelial tissues on the inner wall of the alimentary canal.

Answer 5

Hrmmm. The AC is considered to be the esophagus, stomach, small intestine (duodenum, jejunum and ileum), large intestine (appendix, caecum, colon and rectum), and anal canal.

In general, there are three layers to each tissue- the surface epithelium, underlying muscular layers and outermost serosa.

The epithelium is where the bulk of the interesting things go on. The underlying muscles and nervous tissue are simply involved in peristalsis (moving food along the canal).

Depending on where you are in the AC, the epithelium varies. Most layers have abundant goblet cells that produce mucus for lubrication, many layers also have glands and absorptive cells.

In general- digestion first begins in the mouth and continues down the esophagus as amylases break down starches and sugars. Once in the stomach an acidic enviornment breaks down the food further into smaller bits. Once through the pyloric spincter and into the small intestine, absorption takes place. Bile produced by the liver and stored in the gall bladder serves to emulsify fats. Fats are absorbed via specialized lymphatics in the small intestine known as lacteals. The small intestine is where the bulk of the nutrients are absorbed, the large intestine is largely for the absorption of water and water soluble vitamins. The terminal sections of the large intestine simply remove water from feces and compact it for excretion.