The Respiratory System

what is the main function of the respiratory system?

• to pump blood through the body

• to help in breathing and provide oxygen to the body

• to digest food

• to send signals to the brain

what is the role of the trachea in the respiratory system?

• it pumps blood to the lungs

• it filters food before it enters the stomach

• it carries air to and from the lungs

• it protects the heart

which organ in the respiratory system helps expand and contract the lungs during breathing?

• ribcage

• diaphragm

• trachea

• bronchi

how many lungs does a human have?

• one

• two

• three

• four

what are alveoli?

• large bones in the ribcage

• tiny air sacs inside the lungs

• a type of muscle in the body

• a part of the brain

what happens to the lungs when we breathe in?

• they expand

• they contract

• they disappear

• they sop working

what is the function of the ribcage?

• to help us speak

• to digest food

• to protect the lungs and heart

• to pump oxygen into the blood

what happens to the diaphragm when we exhale?

• it moves up

• it moves down

• it stops working

• it turns into a bone

what happens to our lungs when we breathe out?

• expand

• contract

• disappear

• stop working

why do cells in our bodies use oxygen?

• to survive

• to help the blood turn red

• to help us digest food

• to make our bones stronger