Approx. 2.5cm wide + 7m long. Arranged in series of orderly loops. Divided into 3 parts.
first 25-30cm, most chemical digestion takes place here.
3m long, absorption into the circulatory and lymph system
3m long, end of small intestine
Contains nerves and blood vessels, to transport materials to and from intestine. It is an outside layer that holds intestine in place to help prevent damage.
circular and longitudinal, move material by peristalsis
made of folds; projecting from folds are small finger like villi which increase the surface area.
Found in center of each micro villi, provides products of fat digestion
performs more than 500 functions, production of bile, stores glycogen etc.
Stores bile until needed
produces sodium bicarbonate, and many digestive enzymes.
shorter than small intestine, but twice the diameter. Main use is reabsorption of water and the production of vitamin B and K. has three sections.
rises up on the right side of the abdomen
crosses middle of abdomen
goes down the left side of the abdomen, and terminates at the rectum.
in the form of cellulose is necessary for a healthy colon.
Mechanical and chemical digestion begins here. Physical breakdown of food by teeth
a one-way digestive tract that makes possible the seperation of digested and undigested food.
forms a bolus (ball) out of the chewed food + pushes it to the back of the mouth into the pharynx
inner layer called the mucosa, allows for smooth movement of food. Bolus activates stretch receptors which in turn activate smooth muscles that start peristalsis
Rhythmic, wavelike contractions
J-shaped - mostly involved in digestion but small amount of absorption
is composed of three types of cells (mucous, hydrochloric acid & enzyme)
protects stomach lining
protein substances that speed up chemical reactions.
assists in breakdown of fibrous tissue and destroys foreign organisms
enzyme that breaks down proteins
Regulates movement of food into stomach and helps to prevent it from going back into the esophagus.
located between stomach and small intestine, controls the movement of partially, digested food.
the process of taking food into the body through the mouth (as by eating)
The breakdown of complex organic molecules into smaller components by physical and chemical means
the taking up of digested molecules into the cells of the digestive tract
the removal of waste food materials from the body