Essay Title: 

Instructional Planning

April 3, 2016 | Author: | Posted in environmental issues, nature

What Happens When You Eat

Activity 1 : How Long is the Digestive System

Have students cut a piece of yarn according to the following measurements

Allow students to use different color yarn to represent different organs . After the yarn has been cut tie the pieces together

Esophagus 25 cm

Stomach 20 cm

Small Intestine 700 cm

Large Intestine 150 cm Have students work out the percentages or ratios of the lengths of the different organs in the body in to have a numerical idea of the differences along with [banner_entry_middle]

the visual data provided by the string . Find out information (from books provided ) about how much time food spends in each of these parts of the digestive system as well as which types of foods are broken down in each part

Activity 2 : Digestion

Place a sugar cube in a cup of water . Place about a spoonful of granulated

sugar in the other cup of water . Observe what happens

Have students record the time it takes for each type of sugar to dissolve and work out the ratios of these

Activity 3 : Carbohydrate Digestion

Have the students chew two unsalted soda crackers for two minutes without swallowing

Students will be allowed to take check the solution every fifteen seconds and record the solvency of their saliva by counting the number of lumps present in a given amount at these 15-second intervals Children will be instructed to plot the progression on a graph . Have them write a paragraph explaining the slope of the graph

Activity 4 : Hands on Digestion

Place the hamburger , 3 eyedroppers full of 1M HCl , one tablespoon of Digestive Juice A and two tablespoons of Digestive Juice B into a plastic bag

Knead the bad with your hands (simulates the stomach ) for about 10-15 minutes , it will have been reduced to mainly liquid and have a definite odor

have students write a summary of the activity , explaining the action of the hcl on the hamburger and noting any difference between the digested meat and the digested bread

Activity 5 : How do Villi aid the Small Intestine in Absorption

Compare how 1 , 2 , 3 , and 4 folded towels absorb . Dip each towel into a cup of water (use the same amount of water in each cup Record

the volume of water left in the cup (using a graduated cylinder

Explain the comparison between the towels and the villi . How are these similar and how do they differ ? What is the significance , if any of the similarities and differences ? Consider especially the mixture of water and stool and (thinking back to activity 1 ) describe what might happen if the food passed too fast or too slow through the large intestine

Activity 6 : A Digestive System Simulation

Procedure

Things to make ahead of time

1 . FOOD TUBE : Lay out two parallel lines of tape on the floor , 3 ‘apart and long enough for half the class to stand shoulder to shoulder on one side of the parallel

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