How does air enter the respiratory system?
through the nose and mouth
__________________________ breathing is controlled by the body when you are awake or asleep.
involuntary
What is the hollow organ that connects the throat to the trachea and holds our vocal cords?
larynx
Where does carbon dioxide in the body come from?
It is a waste gas from cells.
What is the waste gas that is removed from your body during breathing?
carbon dioxide
What is the large muscle beneath the lungs that helps you inhale and exhale?
diaphragm
______________________ is the breathing in of oxygen.
inhaling
The breathing out of carbon dioxide is called ___________________________.
exhaling
________________________ breathing allows you to hold your breath or control your breath in or out.
voluntary
What is another name for the body part often called the "voice box?"
larynx
The ________________________ do most of the work when it comes to breathing.
lungs
The tiny tubes inside the lungs that lead air into the air sacs are called the _________________________.
bronchioles
How does oxygen get from the air you breathe into the blood?
It passes through the alveoli into the capillaries.
What is another name for the body part often called the "windpipe?"
trachea
The main tube that carries air to your lungs is called the _____________________.
trachea
Air that you breath moves over your vocal cords and creates __________________.
sound
What protects your lungs inside your chest?
your ribs
What are the tiny hairs in the respiratory tract and nose that catch dust and dirt before it reaches the lungs?
cilia
Alveoli are covered by tiny blood vessels called _________________________.
capillaries
At the end of the bronchioles are tiny air sacs that are called ___________________.
alveoli
How often does breathing happen?
every 3 to 5 seconds
What is the pull of air into and back out of the body called?
breathing