Ulcers are open wounds in or on an organ caused by bacteria Everything in between, including your esophagus, stomach, small intestine, and large intestine, are all part of your GI system as well. Smooth muscle is arranged in 2 layers at right angles to each other: circular layer £ contracts: P Q. longitudinal layer === contracts: à ß When the organ contracts the circular muscles the lumen constricts P Q and the organ lengthens.. D: Endocrine cells produce gastrin. Digestive System Bicarbonates are useful in the GI tract to neutralize hydrochloric acid. This type of cell also secretes gastric lipase enzymes, which help digest triglycerides into free fatty acids and di- and mono-glycerides. There is also evidence that the gastric chief cell secretes leptin in response to the presence of food in the stomach. Leptin has been found in the pepsinogen granules of chief cells. Aceonus cells. To identify and describe functions of cellular … Regulation of Gastric Activity § Cephalic Phase § Directed by CNS (Medulla) § Lasts one minute § Neural output via PNS and vagus nerves innervate submucosal plexus § Postganglionic parasympathetic fibers innervate mucous cells, chief cells, parietal cells and G cells § Gastric juice production accelerates (500 ml/hr) (Phase affected by emotional states) Gastric chief cell D : Hydrochloric acid lowers the pH of the gastric juice. Covers the inner and outer surfaces of the stomach to protect against acids. Structure of Gastric Mucosa | Digestive System The digestive system prepares nutrients for utilization by body cells through six activities, or functions: ingestion, mechanical digestion, chemical digestion, movements, absorption, and elimination. Objectives To understand the general organization of organs of the digestive system and how they function to obtain metabolites necessary for growth and energy for the body, yet maintain a barrier between the environment and the internal milieu of the body.
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