The primary function of the respiratory system is to provide oxygen to the body's cells and remove carbon dioxide, a waste product of cellular metabolism.

The diaphragm is the primary muscle responsible for the movement of air into and out of the lungs. It contracts and relaxes to create changes in pressure within the thoracic cavity, causing air to flow in and out.

Diffusion is the process by which gases move from an area of high concentration to an area of low concentration. In the lungs, oxygen diffuses from the alveoli into the bloodstream, while carbon dioxide diffuses from the bloodstream into the alveoli.

Asthma is a chronic respiratory disease characterized by inflammation and narrowing of the airways, leading to recurrent episodes of wheezing, coughing, chest tightness, and shortness of breath.

Smoking is the primary cause of chronic obstructive pulmonary disease (COPD). It damages the airways and lung tissue, leading to airflow limitation and difficulty breathing.

Pneumonia is an infection of the lungs that can cause a variety of symptoms, including fever, cough, shortness of breath, and chest pain.

Tuberculosis is caused by a type of bacteria called Mycobacterium tuberculosis. It primarily affects the lungs, but can also spread to other parts of the body.

Pulmonary edema is a condition in which fluid accumulates in the lungs, causing shortness of breath, coughing, and difficulty breathing.

Spirometry is a common pulmonary function test that measures lung volumes and capacities, such as vital capacity, forced expiratory volume in one second (FEV1), and peak expiratory flow rate (PEFR).

Idiopathic pulmonary fibrosis is a chronic lung disease characterized by the formation of scar tissue in the lungs, leading to shortness of breath, coughing, and difficulty breathing.

Oximetry is a non-invasive method for measuring blood oxygen levels using a pulse oximeter, which is typically placed on a finger or earlobe.

Asthma is a chronic respiratory disease characterized by recurrent episodes of wheezing, coughing, and difficulty breathing, often triggered by allergens, irritants, or exercise.

Capnography is a non-invasive method for measuring carbon dioxide levels in exhaled breath using a capnograph, which is typically placed on a patient's nose or mouth.

Cystic fibrosis is a genetic disorder that affects the lungs and other organs, causing the accumulation of thick, sticky mucus in the airways, leading to recurrent infections and difficulty breathing.

Lobectomy is the surgical removal of a lobe of the lung, typically performed to treat lung cancer or other lung diseases.