When Do the Accessory Respiratory Muscles Become Active

Multiple Choice

When do the accessory respiratory muscles become active?

A) Accessory respiratory muscles become active after approximately 10 minutes of strenuous activity to give the primary muscles time to rest.
B) Accessory respiratory muscles become active sporadically throughout the day to give the primary muscles time to rest.
C) Accessory respiratory muscles become active whenever the primary muscles are unable to move enough air to meet oxygen demand.
D) Accessory respiratory muscles become active at night while sleeping to give the primary muscles time to rest.
E) Accessory respiratory muscles become when you move but the primary muscles dominant when you are sedentary.