respiratory system

After air moves through the pharynx it continues downward. The _____, or windpipe, directs the air into 2 separate branches or tubes.

• mucus
• trachea
• larynx
• epiglottis

a chamber behind the nose and mouth that leads to the trachea

• pharynx
• trachea
• epiglottis
• larynx

cleans, moistens, and warms the air

• trachea
• larynx
• nasal passage
• windpipe

a flap of tissue that closes when we eat so food doesn't not go down the trachea

• larynx
• pharynx
• trachea
• epiglottis

known as the voice box

• windpipe
• larynx
• pharynx
• epiglottis

the gas known as _______ is needed to stay alive and properly.

• oxygen
• carbon dioxide
• nitrogen
• helium

What are the main organs of gas exchange in the respiratory system?

• diapragm
• lungs
• trachea
• bronchi

The two main branches from the trachea (one to each lung)

• bronchi
• alveoli
• capillaries
• bronchioles

The air sacs that are covered with capillaries that separate gases we need from gases we don't need.

• bronchi
• lungs
• oxygen
• alveoli

How is carbon dioxide released from the body? 

• When we exhale
• When we urinate
• When we sweat
• When we inhale