We take in air through our nostrils. When we inhale air, it passes through our nostrils into the nasal cavity and is sent to the lungs through the wind pipe. The lungs are present in the chest cavity. This cavity is covered by the ribs in the both sides. A large muscular sheet called diaphragm forms the floor. During inhalation, ribs move up and and outwards the diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs. This is the breathing process in humans.
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