Lesson Plan of Respiratory System General Science Grade VII

Lesson Plan of Respiratory System

General Science Grade VII

Students’ Learning Outcomes

·         Describe the mechanism of respiration in humans.

Information for Teachers

·         Many animals possess special breathing mechanisms which increase the rate of exchange of gases between the animals and the external environment.

·         The movement of air into and out of the lungs, called “ventilation” renews the oxygen supply in the lungs and removes the surplus carbon dioxide.

·         Breathing is a part of respiration in which air is inhaled and exhaled from the lungs.

Concept Map

Material / Resources

Charts showing breathing mechanism a large plastic bottle, vinyl tube of about 6 mm straw used for two balloons, plastic bags, thread, rubber band, plasticizes, a pair of scissors, plastic bottle.

Worm up activity

·         Call one student in front of the class.

·         Ask the student to take a deep breath and ask the other students to follow the same instruction.

·         Now ask them what they did?

(Expected response: They take in and give out the air)

·         Ask the students to put their hand on their chest and feel the change in the thoracic cavity.

·         After the students response introduce the today’s topic that how the thoracic cavity helps in inhaling and exhaling.

Development

Activity 1

·         Show the model / chart of human respiratory system.

·         Ask the students to point out / identify parts of the respiratory system.

·         Talk about the path or way of air in respiratory system.

·         Draw the path way of air on the board by students instruction and ask them to

Activity 2

·         Show a chart or draw on the board a diagram of the thoracic cavity.

·         Ask the students to inhale air and ask:

o   When you inhale, do your ribs move outwards or inwards?

o   Will the diaphragm move upwards or downwards on inhaling are?

·         Now ask the students to exhale air and ask:

o   When you exhale, do your ribs move outwards or inwards?

o   On exhalation, will the diaphragm move upwards or downwards?

·         Inform the students that the capacity volume of the thoracic cavity will increase during inhalation and decrease during exhalation.

Activity 2

·         Prepare a model as shown in figure.

·         Ask the students to pull the rubber sheet/balloon attached at the base of the model representing the lungs carefully while diaphragm is being pulled downwards.

·         Ask the following questions to involve the students:

o   What happens to the balloon representing the lungs?

o   On inhalation, will the diaphragm move upwards or downwards?

o   What happens when the diaphragm (rubber sheet) is pull down?

o   What happens when the diaphragm (rubber sheet) is relaxed?

o   What is the relationship between movement of diaphragm (rubber sheet) and lungs (balloons)?

Sum up / Conclusion

·         Sum up the lesson by telling the students that breathing is a part of respiration in which air is inhaled and exhaled from the lungs.

·         When air enters the lungs it is called inspiration and when air is removed from the lungs it is called expiration.

Assessment

·         Draw the given table on the board and ask the students to copy on their notebooks.

·         Ask the students to fill the table that how do parts of thoracic cavity help in inhaling and exhaling?

Parts of thoracic cavity	Inhalation	Exhalation
Ribs
Diaphragm

·         Ask the following questions to enhance their learning.

o   Which contains more oxygen inhaled air or exhaled air?

o   What is gaseous exchange?

o   What happens in your lungs?

o   Why does exhaled air have more carbon dioxide than inhaled air?

Follow up

·         Ask the students to prepare a model at home by joining 4 cards strips with thumb pins as shown in the figure.

·         Ask the students to bring their model next day and share the working and mechanism of breathing with their class fellows.