Grade 7 Science: Respiration and the
Respiratory System Revision Worksheet
Part 1: Key Vocabulary Matching
Match the following words with their correct definitions.
Word
Definition
1. Alveoli
a) Tiny air sacs in the lungs where gas
exchange occurs.
2. Trachea
b) Tubes that branch from the trachea and
carry air into the lungs.
3. Larynx
c) The large tube that carries air from your
nose and mouth into your lungs.
4. Diaphragm
d) The muscle under your lungs that helps
with breathing.
5. Bronchi
e) Small blood vessels where oxygen and
carbon dioxide are exchanged between the
blood and alveoli.
6. Capillaries
f) Also known as the voice box, this
structure produces sound as air passes
through it.
Part 2: Fill in the Blanks
Complete the following sentences using the words provided:
Oxygen, Carbon dioxide, Respiration, Lungs, Blood, Energy
1. ________ enters the body when we breathe in through the nose or mouth.
2. The process of ________ takes place inside the cells, releasing ________ from food.
3. Our ________ help to remove ________ from the blood when we breathe out.
4. The ________ carries oxygen to all parts of the body and returns ________ to the lungs to be
exhaled.
Part 3: Diagram Labeling
Look at the diagram of the human respiratory system below and label the following parts:
- Trachea
- Bronchi
- Diaphragm
- Alveoli
- Larynx
Part 4: Comprehension Questions
Answer the following questions in complete sentences:
1. What is the function of the alveoli in the lungs?
Exchange gas
2. Explain the process of gas exchange in the lungs.
3. Why is oxygen important for respiration in cells?
4. What is the difference between breathing and respiration?
Part 5: True or False
Mark each statement as True or False.
1. The trachea is also called the windpipe. ( )
2. Oxygen is used by the cells to release energy from food. ( )
3. Carbon dioxide is a waste product that is released when we breathe in. ( )
4. Respiration only happens in the lungs. ( )
5. The diaphragm helps the lungs move air in and out. ( )