Regular exercise helps make us more alert and energetic, by releasing endorphins which is a chemical that improves our mood.
<span>The lungs are the respiratory structure that controls breathing. They make up a substantial part of the respiratory system, along with the trachea, the ribs, the intercostal muscles and the diaphragm. Each lung contains small tubes called bronchioles which end in air sacs called alveoli.</span>
They tend to get hungry every four hours.
Hope this helps :)
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