Understanding the Respiratory System part 2

What divides into two hollow tubes that enter the lungs?

• The stomach

• The trachea

• The heart

• The liver

What happens when a person inhales?

• Blood is purified

• Oxygen passes into the blood

• Carbon dioxide is inhaled

• Oxygen is exhaled

Which cells deliver oxygen to the body cells?

• Nerve cells

• White blood cells

• Skin cells

• Red blood cells

What do the diaphragm and rib muscles do during breathing?

• They protect the heart

• They digest food

• They move the limbs

• They contract and relax to move air

Why can't people live without oxygen?

• It cools the body

• It strengthens bones

• Cells need it to make energy

• It helps in digestion