Digestion notes

Most mammals do not drink milk after they are weaned. Last edited July 20, The wall of stomach undergoes periodic movement as well as contraction producing churning movement called peristalsis, which results in breakdown of complex food into simpler form.

HDLs have been called good cholesterol and LDLs bad cholesterol because of their probable role in heart disease. Pepsin secreted by the stomach catalyzes the cleavage of covalent bonds in proteins to produce smaller polypeptide chains. The sphincter which guard the opening of common hepato-pancreatic duct.

Swallowing is a complicated mechanism, principally because the pharynx serves respiration and swallowing both. The juices also contain hydrochloric acid, this is because pepsin works best in an acidic environment of pH 2.

The primary products of lipase digestion are free fatty acids and glycerol and few cholesterol and phospholipids. Cardiac esophageal opening, cardiac sphincter 2.

Human Digestive System

Dysentary and other forms of diarrhea are one of the leading causes of infant death. Proteins and amphipathic lipids allow the particle to dissolve in water and act as sites for enzyme and receptor binding.

The structural and functional units of liver containing hepatic cells which are arranged in the form of cords. It is composed of seven compartments and four accessory organs.

Digestive System

The mucosa consists of specialized cells known as epithelial cells. A Salivary glands found in mouth. Generally only monosaccharides are absorbed.

Physiology of digestion

Molars are like pre-molars and used for crushing and chewing. Anal sphincter under autonomic and somatic nervous control. The acid in the juices also kills any germs. It is the first layer that nutrients must pass through to reach the blood stream. Bacteria synthesize vitamin K and folic acid that is absorbed.

Lipases in the mouth and stomach are not very effective because they do not mix well with the lipids. This webpage was created by Peter King. Saliva contains the enzyme amylase which is a carbohydrase and breaks down starch into sugar.

Oral Cavity Mouth Teeth Food enters the mouth and digestion begins with the teeth breaking down the food into smaller pieces. Carbohydrates are broken down into monosaccharides, proteins are broken down into amino acids, and fats are broken down into fatty acids and glycerol.

It is comprised of the duodenum, jejunum and ileum. Triglycerides are reformed in the epithelium cells of the intestine, combined with cholesterol, phospholipids and proteins to form soluble chylomicrons. Lingual lipase still active. The stomach also produces very small amounts of gastric lipase.

Digestion takes place in the digestive tract or gastrointestinal tract, starting at the mouth and ending at the anus, including the esophagus, stomach, duodenum, jejunum, ileum, ascending, transverse and descending colons and the rectum. Digestion can occur naturally at body temperature, however this process takes a very long time as it happens at such a slow rate.

For digestion to increase in these circumstances, body temperature would have to increase as well. The result of all these mixing, chemical digestion, secretion, and absorption is a yellowish paste called chyme, which will be passed on to the small intestine.

Your Digestive System

Notes For Biology Class11 Download In PDF POINTS TO REMEMBER Digestion: The process in alimentary canal by which the complex food is converted mechanically and biochemically into simple substances suitable for absorption and assimilation. Digestive System (Chapter 24) Lecture Materials for Amy Warenda Czura, Ph.D.

Suffolk County Community College Chemical digestion: enzymatic breakdown of large molecules into-buildingeblocks 5. Secretion: enzymes, acids, mucus, water, Ph.D. 1 SCCC BIO Chapter 24 Lecture Notes. Modes of controlacannbe extrinsic or. Human Digestive System This is a complex process.

Function of the Digestive System

The breakdown of the nutrients requires the coordination of several enzymes secreted from specialized cells within the mouth, stomach, intestines, and liver.

Digestion notes
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Digestion and Absorption Notes for Class 11 biology Download pdf