Page 16 - E-Science Prim.6 2024-2025 U1 Con.2,3_Handy

Respiratory System

Function: It provides the body with oxygen & gets rid of carbon

dioxide.

Structure: It consists of lungs, diaphragm and airways (trachea &

bronchi)
During danger, the circulatory system depends on the lungs,
When diaphragm muscle contracts, the lungs take in air rich in

oxygen.
When diaphragm muscle relaxes, the lungs release air rich in carbon

dioxide.

So, by increasing the breathing rate, more oxygenated blood can
be sent to the muscles and brain.

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First Term