Columnar epithelial lining contains millions of gastric pits leading to gastric glands. Stomach empties in 2- 6 hours. Chyme leaves the stomach by pyloric sphincter to enter duodenum. Small Intestine a. Provides inner intestine with velvet appearance.
Lacteal is a small vessel that returns lymph fluid back to bloodstream.
Blood vessels absorb the sugars and amino acids across villus border. Regulation of Digestive Secretions a. Later investigators discovered that hormones secreted by one organ into the bloodstream triggered activity in other tissues. In response to protein, stomach produces gastrin that increase gastric secretions. Has larger diameter than small intestine.