Final answer:
Forced breathing, or hyperpnea, is a mode of breathing in biology that occurs during exercise or actions that require active manipulation of breathing. It involves fast, deep breaths followed by a period of apnea.
Step-by-step explanation:
In biology, fast, deep breaths for a period of time followed by 20-60 seconds of apnea describe forced breathing, also known as hyperpnea. This mode of breathing occurs during exercise or actions that require active manipulation of breathing. During forced breathing, inspiration and expiration both occur due to muscle contractions.