anatomy respiratory what I dont know

Inspiration

Primary muscles:

Diaphragm: contracts and flattens ,

(goes down) to increase thoracic cavity

volume.

External Intercostal muscles:

Elevate the ribs, expanding the chest.

Accessory muscles are used during

Labored breathing-

Sternocleidomastoid : Elevates the

sternum

Scalene: lift the first 2 ribs

Pectoralis minor: Assist in rib elevation