Human Digestive system

produce saliva which lubricates food for easier swallowing and which contains salivary amylast to bein digestion of starch

passageway of both food(into esophagus) and air(into trachea)

mechanical digestion = breaks food into smaller pieces for easier swallowing and to increase surface area for enzymes

mixes food with saliva; moves food between teeth for chewing and to pharynx for swallowing; contains taste buds

covers trachea during swallowing to prevent entry of food

revieves food; site of chemical digestion of starch

transport food bolus from pharynx to stomach by peristalsis

closes during stomach churning to prevent chyme (containing HCL) from moving back into esophagus

produces bile for emulsification of fats fat --->(bile)---> fat droplets

stores and concentrates bile

mechanical digestion of food --> enzyme: chemical digestion of proteins

• produces digestive enzymes and insulin and glycagon hormones
• -produces the hormones insulin(lowers blood sugar), and glycagon (increases blood sugar)

opens and closes to allow chyme to enter small intestine, from tsomach, in small squires

recieves bile from the liver and enzymes and sodium bicarbonate from the pancreas

site of digestion of all food substrates, and of absorption of all nutrient molecules

absorption of water and salts; ecoli bacteria within colon produce useful vitamins and amino acids which are absobed through lining of colon.

no known function in humans, thought to play a role in the immune response

stores feces to defecation = release from body

allow feces to exit body or digestive tract

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