Rhythmic Muscular Contractions Of The Digestive Track Essay
• Segmentation – contraction happening in the small intestine. It divide and mixes the chime (partially digested food and digestive juices)
• Enzymes – proteins that speed up chemical reactions without change to themselves.
• Esophageal sphincter – the opening between the esophagus and he stomach that relaxes and opens to allow the bolus to travel into stomach and then closes behind it. Prevents the reflux of gastric contents.
• Pyloric sphincter – a circular muscle that forms the opening between the duodenum and the stomach. It regulates the passage of food into the small intestine.
Digestive process starts in the mouth. Saliva contains enzyme salivary amylase which breaks down starch into sugar. Other enzyme present in the mouth is lingual lipase which starts to break down fats. Chewing will break down the food into small pieces and increasing the surface area available for enzymes. In the mouth chewed up food is mixed with saliva and other fluids to form bolus. It is soft and easy to swallow.
Connects mouth with the stomach.
In the stomach food is mixed with gastric juices producing semiliquid chyme. Gastric juices are mixture of water, hydrochloric acid, mucus, pepsinogen, gastric lipase, gastrin and intrinsic factor. About 30 to 40% carbohydrates, 10 to 20% proteins and less than 10% fat by the time the chyme is leaving the…