Respiratory System

Invisible gas surrounding Earth ________

• air

• filter

• dust

Taking air into the lungs and expelling it

• Digestion

• Breathing

• oxygen

Life-supporting, colorless, odorless gas.

• Carbon Dioxide

• Oxygen

Principal organs of the respiratory system

It has two branches called bronchi.

• lungs

• trachea

• alveoli

____________ are tiny hairs that collect bacteria.

• cilia

• alveoli

• branchi

The trachea’s purpose is to ____________ the inhaled air.

• filter

• exhale

• breath

_______________ are small spongy air sacs.

• trachea

• alveoli

• lungs

The lungs are inside your _________

• body

• chest

• heart

__________ is a membrane that covers the surface of the lungs from damage as they move inside the thoracic cavity.

• pleura

• diaphragm

• cilia