What are the muscles involved in quiet breathing?
What kind of muscle?
How is contraction initiated?
quiet: diaphragm, external intercostals, and scalene muscles
exercise: diaphragm, external intercostals, scalene muscles, and sternocleidomastoid, abdominal muscles
contraction is initiated by pressure gradients. Inspiration happens when alveolar pressure decreases, expiration is when alveolar pressure increases