Which of the following muscles are considered primary muscles of ventilation? 1. Diaphragm 2. Intercostals 3. Scalenes 4. Sternomastoid
a. 1, 3, and 4
b. 1 and 2
c. 3 only
d. 1, 2, 3, and 4
ANS: B
The diaphragm and intercostal muscles are the primary muscles of ventilation.
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