Essays on Gastrin

I. UNDERSTANDING THE DISEASE AND PATHOPHYSIOLOGY 1. How is acid produced and controlled within the gastrointestinal tract? The production of acid occurs in the stomach by cells that are therein. The cells found in the stomach produce intrinsic factors and hydrochloric acid. There are chemical messengers that help during the activity. They are histamine, gastrin and acetylcholine. Gastrin helps in stimulating the cells to produce secretions when food enters the stomach. An enzyme somatostatin inhibits the secretions when needed. The digestion takes place in three phases; the cephalic phase, gastric phase and the intestinal phase. It is in the ...

Digestion occurs in the gastrointestinal system, which is composed of the gastrointestinal tract (GI tract) and the associated accessory organs.The process of digestion occurs through six steps, namely ingestion, secretion, mixing,digestion, absorption and defecation. (Tortora&Derrickson, 2008).

Anatomy of the digestive system

The GI tract or the alimentary canal is a long winding tube that measures approximately 30 feet (9 meters) in length. The mouth, esophagus, pharynx, stomach, small intestine, large intestine and the anus make up the GI tract.The salivary glands, tongue, teeth, gallbladder, pancreas and the liver make up the associated accessory organs (Tortora&Derrickson, 2008). The mouth. The mouth starts with the ...

Gastric acid is a fluid with a pH value between 1.5 and 3.5 that aids digestion. It is mainly composed of hydrochloric acid, potassium chloride, and sodium chloride. Gastric acid is produced by the lining cells of the stomach, which are called parietal cells, and its role is to aid the digestion of proteins because it prepares longer amino acid molecules to make it easier for the enzymes to break them down. However, several disorders can affect the physiological mechanisms of gastric acid production and cause disorders, and elderly patients are at higher risk than other age groups. There are ...