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