Traces the path of air and what happens to it in different parts of the respiratory

system

Science V

Review

What happens to the lungs as we breathe?

• Breathing refers to the mechanical process of inhaling and exhaling air.

• Inhaling is the taking of ___.• During inhalation, the

__________ contracts and becomes smaller, so the chest cavity expands.• As the chest expands, there

is less air pressure in the lungs, so air rushes in, filling and enlarging the _____.

• Inhaling is the taking of air.• During inhalation, the

diaphragm contracts and becomes smaller, so the chest cavity expands.• As the chest expands, there

is less air pressure in the lungs, so air rushes in, filling and enlarging the lungs.

• Exhaling is expelling used air from the _____.• During exhalation, the diaphragm

move upward while the ___ ____ moves downward, so it goes back to its dome shaped position.• The chest cavity shrinks.• As the chest shrinks, there is high

air pressure in the lungs, which pushes ___ out of the lungs.

Concept Formation• Exhaling is expelling used air

from the lungs.• During exhalation, the diaphragm

move upward while the rib cage moves downward, so it goes back to its dome shaped position.• The chest cavity shrinks.• As the chest shrinks, there is high

air pressure in the lungs, which pushes air out of the lungs.

Checking of Assignment

Did you bring the following?

white cartolinapencil and eraser

marker (pentel pen)water color or crayons

Motivation

• Do you know what happen to the air when it enters your nose?

• What kind of air do we breathe in, do we breathe out?

Presentation

Watch the video clipRespiratory System

byKidsHealthVideos.

Concept Formation

We breathe in air (oxygen) and breathe out carbon dioxide.

Air enter the nostrils of the nose, then passes down into the back of throat to the windpipe. In the lungs, the capillaries pick up the oxygen and goes with blood at the same time, carbon dioxide from the capillaries into the air in the lungs and is given out.

Application

Trace the path of air using the illustration of the respiratory system.

Evaluation

Complete the each sentence to show the path of air as we breathe.

When you breathe in air, the air enters the 1.__________ of your nose. The air then passes into the pharynx and 2.__________. As air travels to the trachea, an opening called 3.__________ leads to the windpipe opens.

Evaluation

If this opens, air passes through as you breathe. However, this closes when you eat to prevent from entering the windpipe or the 4.__________.

From here, air travels into two bronchial tubes which distribute into your lungs. The bronchial tubes branch out into smaller structures called 5. __________.

Answer

Complete the each sentence to show the path of air as we breathe.

When you breathe in air, the air enters the 1.nostrils of your nose. The air then passes into the pharynx and 2.larynx. As air travels to the trachea, an opening called 3.epiglottis leads to the windpipe opens.

Answer

If this opens, air passes through as you breathe. However, this closes when you eat to prevent from entering the windpipe or the 4.trachea.

From here, air travels into two bronchial tubes which distribute into your lungs. The bronchial tubes branch out into smaller structures called 5.bronchioles.

Assignment

Find out if the size of the chest cavity affects the volume of the air drawn.

Name and describe some common ailments affecting the respiratory system