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I believe it would be the bronchiole

The area of a patient's pulmonary system that will be affected if she is coughing up a lot of mucus is bronchioles.

What is Pulmonary System ?

The pulmonary system is also known as the respiratory system. It is composed or the organs involved in breathing. These include the nose, throat, larynx, trachea, bronchi, and lungs.

What is a bronchiole ?

Bronchioles are air passages inside the lungs that branch off like tree limbs from the bronchi.

Due to any trigger or inflammation, excessive coughing can lead to the production of a lot of mucus which will block the bronchioles. As a result less oxygen will be transported to the lungs.

To know more about pulmonary system here

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