The Respiratory System

Humans breathe through which system?

• Cardiovascular System

• Nervous System

• Respiratory System

• Digestive System

What do we breathe in?

• Carbon Dioxide

• Water

• Hydrogen

• Oxygen

Which of the following expands our lungs when we breathe?

• Diaphragm

• Stomach

• Trachea

• Esophagus

Where is oxygen stored in our bodies?

• Brain

• Stomach

• Blood

• Legs

What do we breathe out?

• Water

• Carbon Dioxide

• Hydrogen

• Oxygen

What happens when we exercise?

• It feels easier to breathe because we are getting stronger

• Our hearts pump slower to conserve oxygen

• Our lungs will try to breathe harder and faster to get more oxygen

• Our muscles store energy

TRUE or FALSE: We couldn't talk without air.

• True

• False