Lesson 1 | The Respiratory System
Name Date Class
LESSON 1
The Respiratory System
Directions: Use the clues and the terms listed below to complete the puzzle. NOTE: There is no empty square in
the puzzle between the words of two-word terms.
alveoli breathing bronchi cellular respiration diaphragm
larynx lungs pharynx trachea
1. tubes that branch off of the trachea
2. process that turns food molecules into energy
3. links the nose and mouth to the throat
4. a tube connected to the larynx and held open by C-shaped rings of cartilage
5. a big muscle that helps you breathe
6. sacs where gas exchange occurs
7. also known as the voice box
8. main respiratory organs
9. The letters in the vertical box spell , which is something
that you are doing right now.
Respiration and Circulation 9
Name Date Class
LESSON 1
The Respiratory System
Directions: Label this diagram by writing the correct term from the word bank on each line.
bronchi diaphragm larynx lungs
mouth nose pharynx trachea
Directions: On the line before each definition, write the letter of the term that matches it correctly.
Each term is used only once.
9. tubelike passageway at the top of the throat
10. flap of tissue at the lower end of the pharynx
11. a triangle-shaped area that holds the vocal cords
12. a tube that serves as the body’s windpipe
13. narrow tubes that lead into the lungs
14. the main organs of the respiratory system
15. small tubes of the respiratory system
16. microscopic sacs where gas exchange occurs
A. lungs
B. pharynx
C. alveoli
D. bronchi
E. trachea
F. epiglottis
G. bronchioles
H. larynx
Respiration and Circulation 13
Name Date Class
LESSON 1
The Respiratory System
Directions: Use the clues and the terms listed below to complete the puzzle.
bronchi bronchioles carbon dioxide cellular respiration homeostasis
oxygen respiratory illness surface area trachea vocal chords
CLUES
Across
5. stability between working systems
6. narrow tubes leading to the lungsa
cold, allergy, or asthma
8. small tubes in the lungs
9. release of energy from sugars
10. the windpipe
Down
1. a cold, allergy, or asthma
2. tissues that vibrate and make sound
3. enables a high rate of gas exchange
4. a waste product of cellular respiration
7. gas needed for cellular respiration
14 Respiration and Circulation
Name Date Class
LESSON 1
The Respiratory System
Key Concept How do the parts of the respiratory system work together?
Directions: Label this diagram by writing the correct letter for each term in the word bank on each line.
A. alveoli C. carbon dioxide E. oxygen
B. blood vessel D. lung F. red blood cells
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Content Vocabulary
Content Practice A
1.
2.
5.
6.
7.
3.
8.
4.
Content Practice B
Key Concept Builder
Wall of
alveolus
5.
6.
2.
4.
3.
Gas exchange in alveoli
1.
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