KINESIOL 2YY3 Chapter Notes - Chapter 24: Gastric Pits, Stomach, Gastric Glands

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 2YY3
• Professor: Krista Howarth

Document Summary

Mechanically you chew and break up food into smaller components to maximize chemical digestion. A(cid:271)sorptio(cid:374) of (cid:374)utrie(cid:374)ts is the e(cid:374)d goal of the food (cid:449)e are digesti(cid:374)g. 2 classes of nutrients: macronutrients (fats, carbs, proteins gives our cells energy) 24. 8 stomach s(cid:449)allo(cid:449) a pie(cid:272)e of food, o(cid:374)(cid:272)e food is i(cid:374) sto(cid:373)a(cid:272)h . While stomach is digesting food, we want he gastroesophageal spincter contracted. Histology of the stomach: gastric pits: openings for gastric glands. Secretions: mucus: protects stomach lining from acid and digestive enzymes, parietal cells: hydrochloric acid and intrinsic factor, chief cells: pepsinogen. Endocrine: regulatory hormones: histamine: stimulates acid secretion, gastrin. Mucosa is thick layer that houses the gastric pits. E(cid:272)retio(cid:374) of gastri(cid:374) a(cid:374)d hista(cid:373)i(cid:374)e sti(cid:373)ulates hcl a(cid:374)d pepsi(cid:374)oge(cid:374) se(cid:272)retio(cid:374: gastric phase greatest a(cid:373)ou(cid:374)t. Inhibits gastric secretions: once intestine receives what has left the stomach, there is no need for stomach to continue releasing acid.