Parts of the Respiratory System
What two body parts let air into the respiratory system?
Nose and mouth
What is the main job of the nose when breathing?
To filter, warm, and moisten the air
What tiny air sacs are at the end of the bronchioles?
Alveoli
What is the tube that connects the throat to the lungs?
Trachea or windpipe
Why do we sometimes breathe through our mouth instead of our nose?
When we need more air quickly, like during exercise
Why do we need oxygen?
Our cells use it to make energy
What are the two large tubes that branch off the trachea?
Bronchi
What does the trachea do?
It carries air from the throat to the lungs
Why do we need to get rid of carbon dioxide?
It is a waste gas that can harm our body if it builds up
What do the bronchi split into?
Bronchioles
What does the diaphragm do when we breathe in?
It moves down to let air in
What happens inside the alveoli?
Oxygen enters the blood, and carbon dioxide leaves the blood
What is the muscle under the lungs that helps us breathe?
Diaphragm
What happens to the diaphragm when we breathe out?
It moves up to push air out
What system works with the respiratory system to move oxygen through the body?
The circulatory system (heart and blood)