DIGESTIVE SYSTEM

BY CHARITY G.

Bibliography• http://en.wikipedia.org/wiki/ Mucus• http://en.wikipedia.org/wiki/ Amylase• www.Google.com/liver/images• http://en.wikipedia.org/wiki/Liver• www.google.com/mouth/images• www.Google.com/esophagus

cartoons/images• www.google .com/stomach

cartoons/images• www.google.com/bile duct/images

mouth• The mouth makes the food more

chewed up so that it can go down easier through the esophagus.

ESOPHAGUS• It is a long tubing which allows

food to be transferred to the small intestine through peristalsis. No digestion occurs in the esophagus.

STOMACH• The stomach is located between the

esophagus and the small intestine. It secretes protein-digesting enzymes called protease and strong acids to aid in food digestion, through smooth muscular contortions before sending partially digested food to the small intestines.

SMALL INTESTINE• The small intestine absorbs small food

particles through micro villi (small finger-like tentacles that line the small intestine wall). The nutrients then go to the veins and is carried through the body by blood.

LARGE INTESTINE

• Mostly its job is simple, to absorb the water from the very liquid feceas before it is secreted.

PANCREAS• There are two main functions of the

pancreas. First, it is the organ that is responsible for producing and releasing the body's supply of insulin. Second, it produces powerful enzymes whose job is to break down foods such as carbs, proteins and fats.

ENZYMES• Much of the information about

enzymes has been made possible because they can be isolated from cells and made to work in a test tube environment.

Gall bladder• The gallbladder is a hollow system

that sits just beneath the liver.• In vertebrates the gallbladder is a

small organ that aids mainly in fat digestion and concentrates bile produced by the liver

BILE/BILE DUCT• A bile duct is any of a number of long

tube-like structures that carry bile.• Bile, required for the digestion of food,

is secreted by the liver into passages that carry bile toward the hepatic duct, which joins with the cystic duct to form the common bile duct, which opens into the intestine.

LIVER• It produces bile and the

gallbladder stores the bile

APPENDIX• The appendix is a narrow, muscular,

worm-shaped tube. One end is attached to the first part of the large intestine. The other end is closed and its position in the body can vary from person to person.

• Indigestible food moves from the small intestine into the appendix, and is then forced out again, as the appendix contracts its muscular walls, into the large intestine.

MUCUS

• Mucus is thick, viscous, gel-like material that functions to moisten and protect inner body surfaces

Chemical digestion

• It's the chemical breakdown of food into simpler compounds. Proteins are broken down to amino acids, carbohydrates are broken down to simple sugars, and fats are broken down to fatty acids and glycerol.

Mechanical Digestion• Mechanical- takes place in the

mouth, because your teeth chew on the food.chemical- using chemicals to digest and break down food. This takes place in your stomach, where gastric juice of hydrochloric acid, enzymes, and pepsin is released. Protein is digested by the pepsin.

SALIVARY AMYLASE

• Amylase is an enzyme that catalyses the down of starch into sugars. Amylase is present in human saliva, where it begins the chemical process of digestion. Foods that contain much starch but little sugar, such as rice and potato, taste slightly sweet as they are chewed because amylase turns some of their starch into sugar in the mouth.

ABSORPTION

VILLI• Villi increase the internal surface

area of the intestinal walls. Increased surface area allows for increased intestinal wall area that is available for absorption.

Gastric juice