Ch.4 - Air and Life

What do we need from the air to stay alive?

What are the major organs of the respiratory system?

Tick the organ(s) below.

• nose and mouth

• lungs

• kidneys

• trachea

• bronchus

When we inhale, our lungs ______________ and air goes ______________ the lungs.

• expand/into

• contract/out of

When we exhale, our lungs ______________ and air goes ______________ the lungs.

• expand/into

• contract/out of

When we breathe out, we release more ________________ than when we breathed in.

• Oxygen

• Carbon Dioxide

• Nitrogen and other gases

Plants take in ________________ and water from soil to make food for itself.

What do plants release during photosynthesis?

Why do we yawn?

• To inhale more carbon dioxide and exhale oxygen from our body

• To inhale more oxygen and exhale carbon dioxide from our body

When we breathe, our chest expands and contracts. We breathe in oxygen, and breathe out carbon dioxide and __________________.

What is the function of the bronchus?

• It carry blood to the lungs.

• They direct the air we breathe to our right and left lungs.

• They hold the lungs together,

• The act as a vacuum that pulls air into the lungs.