Describing structure and function of lungs

Objectives:

To develop the skill of model making and describing.

Materials required:

2 Liter water bottle with cap, 2-3 straws, polythene cover, two balloons, scissors, thread, glue, knife.

Pre-requisites:

Meaning of inhalation and exhalation

Process:

Give students the following instructions:

• Take a 2 liter water bottle; cut 3/4^th the bottle as shown in the figure.
• Take a long straw, bend 1/4^th of the straw, cut small portion of the straw at the bent surface and attach a small piece of other straw to the cut portion and stick it using a gum to make a Y-tube.
• Tie two balloons to both the ends of the Y-tube using a thread.
• Make a hole in the cap of the bottle and insert a Y-tube with balloons into it. Now, place it in the bottle by turning the cap
• Cover the bottom of the bottle using a transparent polythene cover. (Note-Bottle should not be covered tightly).
• Model of lungs is now ready. Pull the transparent cover downwards you will see the balloons inflating, when you release the cover you see the balloons deflating.
• Describe the structure and function of the lungs using the model created.

Pedagogic principles:

Describe a life process using the model created.

Assessment:

Criterion	5	4	3	2	1
Follow instruction and work independently	Able to follow Instruction and Work Independently and correctly	Follows Instruction needs help occasionally	Needs help half of the time	Struggles to follow instruction and work	Not able to Follow instruction and work
Describes the structure and function	Describes Independently and appropriately	Describes correct but not appropriate	Describes almost correct	Struggles to describe	Not able to decsribe