N
ON 3: Breathing mechanism
Hands on practical on breathing mechanism.
ocedure:
straws
Plastic bottle
Balloon
Plastic Sheet
pull tab.
Use the Model of the human long that was build earner and answer the following questions
3.1
For each item listed below, provide the appropriate name of the corresponding part in the
human respiratory system.
a) Plastic bottle
b) straws
c) Balloon
d) Plastic Sheet
3.2.
(1)
(1)
(1)
(1)
Pull down the pull tab, observe and record what happens to the plastic sheet and balloon.
• Release the pull tab, observe and record what happens to the plastic sheet and balloon.
3.1.1. Describe what happens to the balloon when the plastic sheet is pulled downwards (1)
3.1.2. Explain the process observed in 3.1.1. in the human body.
(3)
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