BSCI 207 Lecture Notes - Lecture 23: Foregut Fermentation, Enteric Nervous System, Foregut
26 Jan 2016
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Bsci207 - lecture 23 - nutrient assimilation in animals continued. Enzymes in saliva break down food (salivary glands). Accessory glands secrete materials along passage to help break down substances. Gallbladder stones bile aids in digesting lipids. Pancreas produces digestive enzymes and bicarbonate solution. Animals lacking teeth often have crops and gizzards (muscular structure) to grind food. Birds eat pebbles which help digest/grind up food. Gut lumen is lined by gut epithelium (single layer of epithelium cells) where absorption occurs. Together, the gut epithelium and underlying connective tissue = mucosa. Submucosa contains neural network, plus blood vessels and lymph vessels. Enteric nervous system is a complex of nerve nets. Squeeze = anything stuck in diameter gets pushed forward. 2 layers of smooth muscle surrounds submucosa. Between layers is a network of neurons that coordinate muscle contractions to move through the gut. In mammals, amylase in saliva begins to break down starches. Secretes hcl to help break down food.
