MOVEMENTS OF STOMACH AND INTESTINES: MOVEMENTS OF STOMACH AND INTESTINES PRESENTED TO: DR.ROZINA KAUSAR PRESENTED BY: NIMRA ZULFIQAR, FAKHRA BUKHARI, ZEENAT FATIMA, FAIZA ASLAM, TAYYABA RAMZAN, SEHER BASHIR, AYESHA HASSAN The university of faisalabad STOMACH: STOMACH “Stomach is a J-shaped Bulge in alimentary canal, one of the principle organ of digestion, located in in vertebrates between the esophagus and the small intestine” FUNCTIONS OF STOMACH: FUNCTIONS OF STOMACH DIGESTION OF FOOD. ACTS AS A RESERVOIR. SECRETION OF GASTRIC JUICE. CHURNING OF FOOD. ABSORPTION OF MINERALS. MOVEMENTS OF STOMACH: MOVEMENTS OF STOMACH Very little movement is seen in empty stomach until onset of HUNGER. During fasting stomach capacity is 50ml. Filling: When stomach fills with food the smooth muscles relax so that the pressure in the stomach does not rise. This is called receptive relaxation and then nervous reflex occurs. MOV….: MOV…. Peristalsis: “Peristalsis is the contraction And relaxation of smooth muscles.” “The food mix with gastric juice and become semi fluid, known as chyme .” MOV…: MOV… Gastric slow waves: Waves of depolarization and repolarization originate in pacemaker cells. One wave every 20sec is conducted through gap junctions of smooth muscles pylorus basic electric rhythm . SMALL AND LARGE INTESTINES: SMALL AND LARGE INTESTINES “ The small intestine is a long muscular tube-approximately 275 cm long in life and 700cm after death.” “The large intestine is the third –to-last part of digestive system in vertebrates.” MOVEMENTS OF SMALL INTESTINE: MOVEMENTS OF SMALL INTESTINE Small intestine shows two types of movements SEGMENTATION Rhythmical alternating contractions and relaxations occurs. These “shuttling” movements serves to mix chyme and to bring it into contact with the absorptive mucosa. In this way digestion and absorption are promoted. MOV…: MOV… EMPTYING Meal of different composition travel along the intestine at different rates. Digestion and absorption of food are usually complete by this time the residue reaches the ilio-caecal valve MOVEMENTS OF LARGE INTESTINE: MOVEMENTS OF LARGE INTESTINE Three prominent patterns of motility are observed the colon: Segmentation contractions which chop and mix the ingest, presenting it to the mucosa where absorption occurs. These contractions are quite prominent in some species, forming sacculations in the colon known as hausta . Ant peristaltic contractions propagate toward the ileum , which serves to retard the movement of ingest through the colon, allowing additional opportunity for absorption of water and electrolytes. Peristaltic contractions, in addition to influx from the small intestine, facilitate movement of ingest through the colon. Mass movements constitute a type of motility not seen elsewhere in the digestive tube. Known also as giant migrating contractions, this pattern of motility is like a very intense and prolonged peristaltic contraction which strips an area of large intestine clear of contents.