Indok Park

Source: Indok Park , http://www.harcourtschool.com/activity/digest/index.htm

Date: 1^st week of the month, Wednesday and Thursday

Grade Level: Highschool

TEKS:

§115.32. Health 1, Grades 9-10 (One-Half Credit).

(6)  Health behaviors. The student assesses the relationship between body structure and function and personal health throughout the life span. The student is expected to:

(A)  examine the effects of health behaviors on body systems;

§112.43. Biology.

(10)  Science concepts. The student knows that, at all levels of nature, living systems are found within other living systems, each with its own boundary and limits. The student is expected to:

(A)  interpret the functions of systems in organisms including circulatory, digestive, nervous, endocrine, reproductive, integumentary, skeletal, respiratory, muscular, excretory, and immune;

OBJECTIVES

· Students will be able to:

Identify the parts of the digestive tract

Recognize the function of each part of the digestive tract

Locate where fats, carbohydrates, and protein are initially broken down

Week 1: Wednesday

Digestive System Tract Anatomy

                       Teacher Does                                                 Student Does

Engage: Learning Experience A) Have students break up into pairs or groups of three and explore the simulation on the digestive tract anatomy at http://www.harcourtschool.com/activity/digest/index.htm

Hoped for student response Students will be engaged by the simulation. They will know the anatomy of the digestive system tract and know the location of each part.

Evaluate

Note whether all students are actively participating and interested. 

Explore: Learning Experience The pairs/groups then move on to the next simulation: function of the digestive tract. As the students explore the site, they will complete a worksheet that will help them identify the function of each part of the digestive tract. Students will also refer to their text for help. Questions Where does digestion first begin? What do the teeth do? How can chewing more before swallowing be helpful in digestion? What occurs in the stomach? What is secreted by the stomach and how does that substance help digestion? What is the difference between the large and small intestine? What is absorbed by the body

Hoped for Student Response Students will be engaged by the simulation. They will know the anatomy of the digestive system tract and know the location of each part. Students will also discover the function of each part of the digestive tract. Expected Students Response Various responses.  Students are to have a wide range of responses depending on their knowledge of the digestive tract. Possible answers: 1. Digestion begins at the mouth where the teeth breakdown the food into smaller chunks. The smaller it is, the easier it is for greater digestion in the stomach to occur. 2. The stomach secretes gastric juice that stimulates other enzymes to break down the food into disaccharides. 3. The small intestine is where most digestion occurs. Many enzymes are secreted here which help breakdown the food into its basic components of protein, fat, or carbohydrates. The large intestine moves the waste and the nutrients the body needs are reabsorbed. Ecoli also exist in the large intestine that produce vitamin K which helps with our immune system.

 Evaluate

Ask inquiring questions to see if they comprehend the function of each part of the digestive system.

Explain.  Learning Experience: Using the simulation, see if students can observe where fats, protein, or carbohydrate are first broken down. Once the location is identified, the teacher can further explain what occurs. Questions What is first broken down in the mouth? Where is fat first broken down? Where does disaccharides created?

Hoped for Student Response Students will be able to reach a conclusion based on their observations with the simulation. Expected Student Response Protein is first broken down by salivary amylase in the mouth. The large intestine secretes bile, which emulsifies the fat. Bile is stored in the gallbladder. The stomach secretes the gastric juice. The gastric juice stimulates the secretion of pepsin which breakdown protein.

Evaluate

During the explanation, the teacher will see if students can identify the location of the first occurrence of the breakdown of fats, protein, or carbohydrates. Note whether students already have preconceptions of what occurs in the digestive tract and if they understand the function of enzymes.

Extend/Elaborate: Learning Experience Explain that triglycerides, amino acids, and disaccharides must pass through a brush border to break down into its simplest form.

Hoped for student response N/A Expected Student Response N/A

Evaluate

Ask questions to ensure that students understand that the simplest form of fat, protein, and carbohydrate breakdown occur at the brush border membrane and not in the organs of the digestive system.

Digestive Tract Worksheet

Identify the function of the following:

1. Mouth
2. Stomach
3. Small intestine
4. Large intestine
5. Pancreas
6. Gall Bladder
7. Liver

Answer the following:

1. Where does digestion first begin? What do the teeth do? How can chewing more before swallowing be helpful in digestion?

2. What occurs in the stomach? What is secreted by the stomach and how does that substance help digestion?

3. What is the difference between the large and small intestine? What is absorbed by the body?