Understanding the Respiratory System

What is the primary function of the respiratory system?

• To digest food

• To circulate blood

• To help us breathe in fresh air and get rid of bad air

• To control body movements

Where does the air go after entering through the nose?

• Into the stomach

• Directly into the lungs

• Down a tube called the windpipe

• Into the brain

What are the tiny air sacs in the lungs called?

• Alveoli

• Trachea

• Bronchi

• Capillaries

What gas is taken in by the body from the air sacs?

• Nitrogen

• Carbon dioxide

• Oxygen

• Helium

What should we avoid to take care of our lungs?

• Clean air

• Smoke and dirty air

• Healthy food

• Exercise

How does breathing help our bodies besides gas exchange?

• It strengthens our bones

• It helps cool our bodies and keeps our blood healthy

• It improves our vision

• It helps in digestion

What happens to carbon dioxide in the respiratory process?

• It is absorbed into the muscles

• It is stored in the liver

• It goes from the blood into the air sacs

• It is converted into oxygen

What role do the tiny hairs inside the nose play?

• They help in smelling

• They catch dust and dirt

• They warm the air

• They produce mucus

What is the waste gas that is expelled from the body?

• Nitrogen

• Carbon dioxide

• Oxygen

• Hydrogen

What additional function does the nose have besides aiding in breathing?

• It helps in hearing

• It helps in seeing

• It helps in tasting

• It helps in smelling