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The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are the lungs, which carry out this exchange of gases as we breathe.

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Diseases and conditions of the respiratory system fall into two categories:

Infections: influenza
Chronic diseases:  asthma

antibiotics are not effective in treating viruses and the best thing to do is just rest.

Asthma is a chronic inflammation of the airways in the lungs that can cause coughing, wheezing, chest tightness or shortness of breath.
These symptoms and signs can be worse when people are exposed to triggers, including air pollution, tobacco smoke, factory smoke, detergents, infections, pollen, food, cold air, exercise, chemicals and drugs.

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Part of the respiratory system
When we breathe, oxygen enters the nose or mouth and passes through the sinuses, which are the hollow spaces in the skull that help regulate the temperature and humidity of the air we breathe.

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The bronchi split again, allowing air to enter each lung lobe. According to the American Lung Association, the right lung has three flaps, while the left lung has only two flaps to accommodate the heart. The lung lobes are filled with cavernous sacs called alveoli, where oxygen and carbon dioxide exchange occurs.

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Air enters the bronchi from the sinuses through the trachea (also called trachea), which are two tubes (each bronchi) that carry air to each lung. The bronchial tubes are lined with tiny hairs called cilia, which move back and forth, causing mucus to move up or down. Mucus is a viscous liquid that collects dust, bacteria and other substances that invade the lungs. This is the mucus that we expel when we sneeze and cough.