Key Muscles Involved in Breathing: Inspiration & Expiration
Inspiration
* Primary muscles: Diaphragm, intercostal muscles (external intercostals and internal intercostals)
* Accessory muscles: Scalenes, sternocleidomastoid, pectoralis major, serratus anterior, latissimus dorsi
Expiration
* Primary muscles: Internal intercostals, abdominal muscles (rectus abdominis and external obliques)
* Accessory muscles: Diaphragm, scalenes, sternocleidomastoid
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