Example of enzyme involved with digestion of protein,probiotic 10 50 billion zimbabwe,probiotic powder on skin 79 - PDF Review

Human Digestive System Function The main function of the digestive system is to break down large macromolecules (proteins, fats and starch) into smaller molecules (amino acids, fatty acids and glucose) that can be absorbed into the circulatory system for distribution around your body. Introduction to Digestion The pathway that food takes as it moves through the body during digestion is known as the digestive tract or the alimentary canal. Structures in the Human Digestive System Food enters the alimentary canal through the mouth opening; the chamber that it enters is called the oral cavity. The tongue helps to move the food around in the oral cavity, pushing the food between the teeth, which chew the food.
The food is also lubricated in the mouth by the saliva, which is produced by three sets of salivary glands.
There are 3 pairs of salivary glands that secrete their fluids into the mouth: The Parotid Gland is located just in front of and slightly below the level of the opening of the ear. The Sublingual Gland is located under the tongue and secretes mostly thick stringy mucus, salts and salivary amylase.
Uvula a small mass of tissue that hangs down in the back of the mouth, and moves up to close off the openings to the nasal cavity when food is swallowed into the esophagus.
Soft Palate the roof of the pharynx in the back of the mouth this soft tissue functions in closing off the openings to the nose and ears as food is swallowed.
Food moves down your esophagus, pushed through by the rings of smooth muscle found in the walls of the esophagus.
Cardiac sphincter muscle Close off the opening to the stomach and serve to control the movement of swallowed material into the stomach.
Three layers of muscle in the wall of the stomach contract and relax to mechanically break down the stomach's contents.
Hydrochloric Acid This powerful acid protects us from harmful bacteria-what we may ingest with foods is fried by this strong acid.
Mucous The stomach is lined with mucous that coats the cells lining the stomach and protects them from the digestive action of the enzyme pepsin. Pyloric Sphincter Located between the stomach and the small intestine Controls the movement of the chyme into the small intestine The stomach pushes chyme into it by peristalsis.


Digestion in the Small Intestines The digestion that occurs is primarily chemical, most of which occurs in the duodenum. The small intestine also possesses intestine glands that produce its own secretions; intestinal juice. The Importance of Bile In the small intestine, large lipid molecules (fats) are physically broken down or emulsified by bile (this is a mechanical process). This is the largest of the glands which secretes salts, an enzyme (salivary amylase) and a watery serous fluid into the mouth through the parotid duct. The bolus (ball of food) is swallowed and enters the esophagus or food tube, which lies behind the trachea and runs down the centre of your neck. Keeps partially digested food and stomach acid from working their way back up the esophagus, called reflux or better known as heartburn. Rhymes with time (the h is silent) About 9L of chyme enters your small intestine every day.
HCl also helps keep the three pounds of bacteria found in the colon from moving up into the small intestine. It begins the digestion of protein and stimulates the pancreas to produce digestive enzymes. Once the pH level of the stomach reaches a level of 2 or lower, pepsinogen is converted into pepsin, an active enzyme which begins the breakdown of proteins.
Unfortunately these protective measures do not always work, and the stomach starts to digest itself. In adult humans, the small intestine is 5-6 metres in length, has a surface area of a 500-600m long tube and takes up a significant portion of the abdominal cavity. The enzymes that act chemically on food to digest it come from the small intestine and the pancreas.
Peristalsis continues in the small intestine, churning and pushing the partially digested food through until it reaches the large intestine. The bile duct carries bile into the duodenum of the small intestine where it acts to emulsify fats, breaking them up into tiny droplets.


There are more than five hundred different enzymes in every cell of the body, each of them helping the cell, and the body as a whole, to work.
We need to digest food in order for us to get the energy (ATP) that is in it, into a useful form. Not only does saliva lubricate the food, it also begins to chemically digest carbohydrates in the food you have eaten.
Since the salivary glands deliver their secretions through ducts, they are called exocrine glands. Trachea, or windpipe, connects the pharynx to the lungs and is found in front of the esophagus. This rhythmic contraction is called peristalsis and it continues through the entire length of the digestive tract. These secretions and the stomach's mechanical churning of the food act to further soften it and break it up into smaller pieces, taking on a soup-like consistency.
If this happens, "bad" bacteria and yeast can establish a foothold in the intestine, resulting in less than optimum absorption of nutrients and inflamed intestines. It produces some serous fluid and some mucous and delivers them to the mouth through the submaxillary duct.
Our food passes through our bodies and into our bloodstream too quickly and becomes seen as invaders (allergens) in our body. Of the approximate 1L of saliva produced every day, 99% of that is water, with the remainder being mucus and enzymes. This water moistens and dissolves particles of food while mucous helps make chewed food smooth and easy to swallow.



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