Spirometry

Spirometry

Respiration
* External respiration – Gas exchange between blood and alveoli
* Internal respiration – Gas exchange between blood and tissue cells

Pulmonary Ventilation
* Inspiration – Diaphragm and intercostals muscles contract resulting in increased volume and decreased pressure in the thoracic cavity; air rushes in
* Expiration – Diaphragm and intercostals muscles relax resulting in decreased volume and increased pressure in the thoracic cavity; air pushed out

Respiratory Volumes
* Tidal volume - normal amount of air inhales or exhaled
* Inspiratory reserve volume amount of air that can be forcefully inhaled after normal inhalation
* Expiratory reserve volume – amount of air that can be forcefully exhaled after normal exhalation
* Vital capacity – maximum amount of air that can be exhaled after maximum inhalation
* Residual volume – amount of air that can be exhaled after maximum inhalation

Factors altering normal function
* Diseases
* Disorders
* Pollutants in the environment
* Trauma

Spirometry.ppt