Page 21 - E-Science Prim.4 2024-2025 U1 Con.1_Neat
P. 21
How does the respiration process take place?
Inhalation (Breathe in) Exhalation (Breathe out)
It is a process by which the air rich in It is a process by which the air rich
oxygen gas enters the lungs through in carbon dioxide gas and water
vapour are expelled out of the
the nasal cavity. lungs through the nasal cavity.
We take oxygen gas We expel carbon dioxide gas and
water vapor.
The diaphragm muscle contracts and The diaphragm muscle relaxes
moves downward. and moves upward.
The size of chest increases. (enlarges) The size of chest decreases.
(narrow)
First Term 21
