An organ of digestion situated in the left upper quadrant of the abdomen between the termination of the esophagus and the beginning of the duodenum.
The expansion of the alimentary canal between the esophagus and the duodenum.
The part of the body shaped like a bag, into which food passes after being swallowed and where the process of digestion continues.
Expandable, saclike organ, located below the diaphragm in the upper left part of the abdomen, which forms part of the digestive tract between the esophagus and the duodenum. The stomach receives partly digested food from the esophagus through the cardiac sphincter. In the stomach the food is churned by muscular layers of the stomach and mixed with the secretions of the gastric glands, chiefly hydrochloric acid and the enzyme pepsin. The semiliquid mass (chyme) then passes through the pyloric sphincter to the duodenum.
A muscular structure that is situated between the esophagus and duodenum, and secretes hydrochloric acid and other digestive juices.
A major organ of the digestive system, located in the upper left side of the abdomen. The stomach receives swallowed food from the esophagus and breaks it down further by means of acidic secretions and churning action. From the stomach, the food passes into the small intestine.
A distensible saclike organ that forms part of the alimentary canal between the esophagus (gullet) and the duodenum. It communicates with the former by means of the cardiac orifice and with the latter by the pyloric sphincter. The stomach lies just below the diaphragm, to the right of the spleen and partly under the liver. Its function is to continue the process of digestion that begins in the mouth. Gastric juice, secreted by gastric glands in the mucosa, contains hydrochloric acid and the enzyme pepsin, which contribute to chemical digestion. This, together with the churning action of the muscular layers of the stomach, reduces the food to a semiliquid partly digested mass that passes on to the duodenum.
A distensible, sac-like organ with an average adult capacity of 1-5 litres, situated in the upper abdomen. It is positioned between the oesophagus and duodenum, lying just beneath the diaphragm to the right of the spleen and partly under the liver. The stomach is a part of the gastrointestinal tract with its walls formed of layers of longitudinal and circular muscles and lined by glandular cells that secrete gastric juice. The exit of the stomach is guarded by a ring of muscle called the pyloric sphincter which controls the passage of food into the duoenum.
A muscular, distensible saclike portion of the alimentary tube between the esophagus and duodenum.
Major body organ that, along with the intestines, digests food.
An organ that is part of the digestive system. It helps in the digestion of food by mixing it with digestive juices and churning it into a thin liquid.
A muscular, saclike organ in the digestive system in which food is stored, churned, mixed, and broken up.
An empty, pouch-shaped organ within the digestive system positioned on the left side of the abdomen beneath the diaphragm. The upper portion of the stomach links to the esophagus (also known as the gullet), while the lower part connects to the duodenum, the initial segment of the small intestine.
The stomach possesses flexibility and can, in an average adult, stretch to accommodate roughly 1.5 liters of food. Its structure comprises layers of longitudinal and circular muscles, covered by unique glandular cells that release gastric juice. Furthermore, the stomach is nourished by blood vessels and nerves. Positioned at the lower extremity of the stomach, a robust muscle shapes a circular band known as the pyloric sphincter, capable of sealing the passage that leads to the duodenum.
With a pliable nature, the stomach can expand to hold approximately 1.5 liters of food in the typical adult. Its composition involves layers of longitudinal and circular muscles, enveloped by distinct glandular cells responsible for secreting gastric juice. Additionally, the stomach receives sustenance through its network of blood vessels and nerves. Situated at the stomach’s lower end, a sturdy muscle forms a circular ring named the pyloric sphincter, which can effectively close off the pathway leading to the duodenum.
The visual and olfactory perception of food, coupled with its entrance into the stomach, triggers the stomach lining to produce gastric juice. This fluid comprises pepsin, an enzyme that dismantles proteins; hydrochloric acid, responsible for bacteria elimination and the creation of an ideal pH environment for pepsin’s effectiveness; and intrinsic factor, crucial for vitamin B12 absorption within the small intestine. Additionally, the lining generates mucus to prevent the stomach from self-digestion.
The muscular strata within the stomach’s wall generate regular contractions occurring roughly every 20 seconds. These contractions facilitate the mixing of food and gastric juice. Through this mechanism, partially solid food undergoes transformation into a velvety liquid substance known as chyme. At predictable intervals, the stomach muscles contract while the pyloric sphincter loosens its grip, propelling the partially digested food into the duodenum.
The oval-shaped digestive pouch located in the upper part of the abdomen just below the diaphragm. It has two ends: the upper, known as the cardiac end, connects to the esophagus, and the lower, referred to as the pyloric end, connects to the duodenum. The stomach is composed of four layers: an outer peritoneal or serous layer, a muscular layer consisting of longitudinal, oblique, and circular fibers, a submucous layer, and a mucous layer. The mucous layer contains glands that produce gastric juice, which includes mucus and hydrochloric acid.