Digestive system Flashcards
Digestive System
Ingestion, Digestion, Egestion
Ingestion
Food intake
Digestion
Breaking down of ingested particle into molecules that can be absorbed
Egestion
Elimination of indigestible material
Two categories of digestive organs
Alimentary canal, Accessory organs
Alimentary Canal
Gastrointestinal tract (GI) includes food tract
Accessory organs
Organs that aid in digestion but are designed as that pathway for food (though teeth, liver, gallbladder, pancreas
Amylase
Saliva’s starch digesting enzyme…
Salivary glands
make saliva
Esophagus
digestive tract from mouth to stomach
Peristalsis
Muscle contraction of esophagus
Stomach
Muscular organ that uses digestive enzymes and hydrochloric acid to break food down into incompletely digested food
Stomach lining secrets…
mucous to protect it from acids
Pancreas and Gall bladder release more…
enzymes into small intenstines
Small intestine is where…
Most of absorption occurs in digestion
Small intestine has…
Villi
Villi
provide large surface area of capillaries for absorption of nutrients
Large intestine
where indigestible food proceeds to and water gets absorbed from
waste is then passed through
rectum and then anus
Ruminants
(cows) consume large amounts of vegetation so have several stomach chambers that store CUD that is regurgitated and chewed again
Many invertebrates have this for digesting
Crop, and organs that stores food until it is processed for absorption
Some animals only have… for digestion
sac-like digestive cavity
