Diaphragm
Breathing begins with a dome-shaped muscle located at the bottom of the lungs.
The diaphragm is a thin, dome-shaped muscle located at the bottom of the chest cavity, separating the chest and abdominal cavities. It plays a vital role in the process of breathing, specifically in the process of inhalation.
During inhalation, the diaphragm contracts and moves downward, expanding the chest cavity and increasing the space for the lungs to expand. This allows air to flow from the outside into the lungs, filling them with oxygen.
During exhalation, the diaphragm relaxes and moves upward, reducing the space within the chest cavity and pushing air out of the lungs. The movement of the diaphragm is controlled by the phrenic nerve, which is located in the spinal cord.
In addition to its role in breathing, the diaphragm also plays a role in other bodily functions, such as digestion and supporting the organs of the abdominal cavity. It can also play a role in certain medical conditions, such as diaphragmatic paralysis and hiatal hernias.
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