Respiratory System Quiz

What is the main organ of the respiratory system?

• Heart

• Liver

• Lungs

• Stomach

What tube connects the throat to the lungs?

• Esophagus

• Trachea

• Bronchi

• Diaphragm

What muscle helps the lungs to expand and contract?

• Rib cage

• Diaphragm

• Heart

• Stomach

What gas do humans inhale to survive?

• Carbon dioxide

• Nitrogen

• Oxygen

• Hydrogen

What gas do humans exhale as waste?

• Oxygen

• Carbon dioxide

• Nitrogen

• Helium

What are the tiny air sacs in the lungs where gas exchange happens?

• Bronchi

• Alveoli

• Trachea

• Capillaries

What protects the lungs and helps them expand?

• Skull

• Ribs

• Spine

• Liver

How many lungs does a human have?

• One

• Two

• Three

• Four

Which part of the respiratory system filters dust and dirt from the air?

• Lungs

• Bronchi

• Nose

• Diaphragm

What happens when the diaphragm contracts?

• You breathe in

• You breathe out

• Your lungs shrink

• Your heart stops