The Digestive System. How is food digested? Digestion involves: Breaking down of food into smaller pieces Breaking down of food into smaller pieces The

The Digestive SystemThe Digestive System

How is food digested?How is food digested?

How is food digested?How is food digested?

Digestion involves:Digestion involves:

Breaking down of food into smaller piecesBreaking down of food into smaller pieces The mixing of foodThe mixing of food Movement through the digestive tractMovement through the digestive tract Chemical breakdown of the large Chemical breakdown of the large

molecules of food into smaller molecules. molecules of food into smaller molecules.

Describe the digestive Describe the digestive systemsystem

Describe the digestive Describe the digestive systemsystem

The digestive tract is a series of The digestive tract is a series of hollow organs joined in a tube from hollow organs joined in a tube from the mouth to the anus. Food passes the mouth to the anus. Food passes through the digestive tract.through the digestive tract.

Accessory organs include the liver, Accessory organs include the liver, gall bladder, and pancreas. Food gall bladder, and pancreas. Food does not pass through these organs.does not pass through these organs.

Identify the organs of the Identify the organs of the digestive systemdigestive system

Identify the organs of the Identify the organs of the digestive systemdigestive system

Identify and tell the function of Identify and tell the function of each part of the digestive each part of the digestive

systemsystem


systemsystemMouthMouth

Teeth bite off and chew food into a Teeth bite off and chew food into a soft pulp that is easy to swallow. soft pulp that is easy to swallow.

Chewing mixes the food with saliva, Chewing mixes the food with saliva, from salivary glands around the from salivary glands around the mouth and face, to make it moist and mouth and face, to make it moist and easy to swallow.easy to swallow.


systemsystemMouthMouth

Enzymes in the saliva begin digestion Enzymes in the saliva begin digestion of carbohydrates.of carbohydrates.


systemsystemEsophagusEsophagus

The esophagus is a muscular tube. It The esophagus is a muscular tube. It takes food from the throat and takes food from the throat and pushes it down through the neck, pushes it down through the neck, and into the stomach. and into the stomach.

It moves food by waves of muscle It moves food by waves of muscle contraction called peristalsis.contraction called peristalsis.


systemsystemStomachStomach

The stomach has thick muscles in its The stomach has thick muscles in its wall. These contract to mash the food wall. These contract to mash the food into a water soup called chyme. into a water soup called chyme.

The stomach lining produces strong The stomach lining produces strong digestive juices. digestive juices.


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StomachStomach

These create chemical reactions in the These create chemical reactions in the stomach, breaking down and dissolving stomach, breaking down and dissolving its nutrients. its nutrients.


systemsystemSmall IntestineSmall Intestine This part of the digestive tract is This part of the digestive tract is

narrow, but very long - about 20 feet. narrow, but very long - about 20 feet.

Enzymes continue the chemical Enzymes continue the chemical reactions on the food. reactions on the food.


systemsystemSmall IntestineSmall Intestine The nutrients are broken down small The nutrients are broken down small

enough to pass through the lining of enough to pass through the lining of the small intestine, and into the blood the small intestine, and into the blood (diffusion). (diffusion).

Nutrients are carried away to the liver Nutrients are carried away to the liver and other body parts to be processed, and other body parts to be processed, stored and distributed.stored and distributed.


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Large IntestineLarge Intestine

Useful substances that were not Useful substances that were not absorbed in the small intestine, absorbed in the small intestine, such as spare water and body such as spare water and body minerals, are absorbed through the minerals, are absorbed through the walls of the large intestine, back walls of the large intestine, back into the blood. into the blood.


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Large IntestineLarge Intestine

The remains are formed into The remains are formed into brown, semi-solid feces, ready to brown, semi-solid feces, ready to be removed from the body be removed from the body


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systemsystemRectum and AnusRectum and Anus

The end of the large intestine and the The end of the large intestine and the next part of the tract, the rectum, next part of the tract, the rectum, store the feces. store the feces.

Feces are finally squeezed through a Feces are finally squeezed through a ring of muscle, the anus, and out of ring of muscle, the anus, and out of the body.the body.


systemsystemPancreasPancreas

The pancreas, like the stomach, The pancreas, like the stomach, makes digestive juices called makes digestive juices called enzymes which help to digest food enzymes which help to digest food further as it enters the small further as it enters the small intestines. intestines.


systemsystem

Gall BladderGall Bladder

A small baglike part under the liver.A small baglike part under the liver.

It stores a fluid called bile, which is It stores a fluid called bile, which is made in the liver. made in the liver.


systemsystemGall BladderGall Bladder

As food from a meal enters the small As food from a meal enters the small intestine, bile flows from the gall intestine, bile flows from the gall bladder along the bile duct into the bladder along the bile duct into the intestine. intestine.

It helps to digest fatty foods and also It helps to digest fatty foods and also contains wastes for removal. contains wastes for removal.


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LiverLiver

Blood from the intestines enters to Blood from the intestines enters to the liver, carrying nutrients, vitamins the liver, carrying nutrients, vitamins and minerals, and other products and minerals, and other products from digestion. from digestion.


systemsystemLiverLiver

The liver is like a food-processing The liver is like a food-processing factory with more than 200 different factory with more than 200 different jobs. It stores some nutrients, jobs. It stores some nutrients, changes them from one form to changes them from one form to another, and releases them into the another, and releases them into the blood according to the activities and blood according to the activities and needs of the body.needs of the body.

Describe waterDescribe water

Most of the nutrients in your body Most of the nutrients in your body can't be used unless they are carried can't be used unless they are carried in a solution. This means that they in a solution. This means that they have to be dissolved in water. have to be dissolved in water.

In cells, chemical reactions take In cells, chemical reactions take place in solutions. place in solutions.

Describe waterDescribe water

Most of the material absorbed from Most of the material absorbed from the cavity of the small intestine is the cavity of the small intestine is water in which salt is dissolved. water in which salt is dissolved.

The salt and water come from the The salt and water come from the food and liquid we swallow and the food and liquid we swallow and the juices secreted by the many juices secreted by the many digestive glands.digestive glands.

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The Digestive System. How is food digested? Digestion involves: Breaking down of food into smaller pieces Breaking down of food into smaller pieces The