Normal respiratory muscles generally do not fatigue with work less than _________

A. 4 to 6 joules/minute
B. 10 to 12 joules/minute
C. 15 to 20 joules/minute
D. 20 to 25 joules/minute

?ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: The normal range for work done by the respiratory muscles is 4 to 6 joules/minute. Normal respiratory muscles generally do not fatigue with work less than 20 to 25 joules/minute.

Health Professions

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