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carbon di oxide = turns lime water milky
trachea = passage for air to pass i
diaphragm = muscular sheet
alveoli = air sacs for exchange of gases
muscle cells = lactic acid
During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside.
When you breathe out, or exhale, your diaphragm and rib muscles relax, reducing the space in the chest cavity. As the chest cavity gets smaller, your lungs deflate, similar to releasing of air from a balloon.
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