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How We Breathe

Chapter 8:3
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Across
1
______ comes into your body through your nose and mouth.
2
_______ returning to the heart from the rest of the body is full of carbon dioxide.
3
A tube that connects the trachea to a lung.
4
Bronchiole are so small you need a _________ to see them.
6
The exchange of carbon dioxide and oxygen is called ________.
8
At rest, you usually breathe about ____ times a minute.
10
The passageway between the mouth and the esophagus for air and food.
11
The walls of the alveoli are only one _____ cell thick.
13
Carbon dioxide leaves the body when you _______.
Down
1
Just like the heartbeat, breathing is _____
2
A tube that branches off the bronchus.
5
Another name for a trachea is a __________.
7
A tiny sac at the end of each bronchiole that holds air.
9
The lungs stretch and you take in about half a ______ of air.
12
The voice box.