title: List of terms of lung size and activity
text: # List of terms of lung size and activity
  
  Following are terms that specify a type of lung size and/or activity. More specific definitions may be found in individual articles.
  
  * Eupnea – normal breathing
  * Apnea – absence of breathing
  * Bradypnea – decreased breathing rate
  * Dyspnea or shortness of breath – sensation of respiratory distress
  * Hyperaeration/Hyperinflation – increased lung volume
  * Hyperpnea – fast and deep breathing
  * Hyperventilation – increased breathing that causes $CO_2$ loss
  * Hypopnea – slow and shallow breathing
  * Hypoventilation – decreased breathing that causes $CO_2$ gain
  * Labored breathing – physical presentation of respiratory distress
  * Tachypnea – increased breathing rate
  * Orthopnea – Breathlessness in lying down position relieved by sitting up or standing
  * Platypnea – Breathlessness when seated or standing, relieved by lying flat
  * Trepopnea – Breathlessness when lying flat relieved by lying in a lateral position
  * Ponopnea – Painful breathing
  