B90.9: Sequelae of respiratory and unspecified tuberculosis
Tuberculosis is also abbreviated to TB. Tuberculosis is caused by certain bacteria. The bacteria are transmitted through coughing and sneezing, for example. The bacteria can remain undetected in the body for a very long time. But they can also cause severe inflammations. The bacteria trigger symptoms when the body’s defense system is weakened. For example, tuberculosis may cause fever, coughing and a feeling of weakness. It is also possible to lose weight and feel very tired. Tuberculosis can cause changes in the lungs or respiratory system, for example.
When we breathe, the air gets into the body via the respiratory tract. The respiratory tract can be divided into the upper and the lower respiratory tracts. The nose and throat form part of the upper respiratory tract. The lower respiratory tract begins at the larynx. This includes the trachea and the bronchia. You need lungs to breathe. When we breathe in, oxygen enters the lungs and accumulates in the blood. This blood then flows to the heart. The heart then pumps the oxygen-rich blood throughout the body. All of the organs are supplied with oxygen as a result.
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