The Digestive System

Lesson5– Digestive System Model

Objectives:• Students will gain a full understanding of

how the digestive and excretory system work in their own bodies.

• Students will be able to name the parts of the digestive system.

• Students will be able to describe the path of food through the digestive system.

• System will be able to assemble a model of the digestive system.

Review What is the first part of the

digestive system? What is the second part of

the digestive system? What is the third part of the

digestive system? What is the fourth part of

the digestive system Describe to a partner

how the all the parts work together to digest food.

Words to Knowpancreas: an organ that creates bile to help in the digestive system

liver: an organ that cleans the digestive system

Digestive System ModelYou will be making a model of the

digestive system but, first you need to build your knowledge.

Review your experiment recording sheet and what you’ve learned for that sheet.

Model- mouthDigestion begins in the

mouth where teeth chew food, breaking it into smaller and smaller pieces and where saliva, flowing out of salivary glands, softens and moistens chewed food.

Direction:color and cut out the head

models. Then glue the tabs together.

Model- esophagusThe tongue pushes small

bits of food to the back of the mouth into the throat. throat muscles direct the food balls into the FOOD TUBE, or esophagus, where muscles keep it moving to the stomach.

Direction:color and cut, then glue the

parts together.

Model- StomachThe muscular, elastic

STOMACH mashes and churns the food. The stomach wall releases digestive juices that break down food. As the stomach churns, food turns into a thick paste called chyme.

Direction:color and cut, then glue the

parts together.

Model- Small Intestine Chyme leaves the lower part and enters

the SMALL INTESTINE. The wall of the small intestine gives off different digestive juices, but there’s are not enough. The gall bladder and LIVER make bile that flows through a duct help break down the food. the PANCREAS produces enzymes-rich juices that flow through the duct to further break down food. These are picked up by million of VILLI which absorb the nutrients into the blood.

Direction: color and cut, then glue the parts

together.

Model-Large Intestine Parts of food the body cannot use are

moved along by muscles in the small intestine wall into the LARGE INTESTINE wall. Most of the water and minerals left in the unusable food parts pass through the wall of the large intestine into the blood. The rest gets hard and is stored in the rectum until it is released from the anus. the opening at the end of the large intestine.

Direction: color and cut, then glue the parts

together.

Review

Use the model to identify the parts of the digestive system to a partner and how they are used.

Then listen as they identify the digestive system and explain how they are used.

Watch Meeeeeee!! Video on the disgestive system https

://www.youtube.com/watch?v=VwrsL-lCZYo