Question

List two accessory muscles of respiration that are active during forced inhalation, but are not active with quiet or deep inhalation.

Answer 1

- sternocleidomastoid,

- the scalenus anterior, medius, and posterior,

- the pectoralis major and minor

Explanation:

The primary inspiratory muscles are the diaphragm and external intercostals. Relaxed normal expiration is a passive process, happens because of the elastic recoil of the lungs and surface tension.

The accessory inspiratory muscles are the sternocleidomastoid, the scalenus anterior, medius, and posterior, the pectoralis major and minor, the inferior fibres of serratus anterior and latissimus dorsi, the serratus posterior anterior may help in active inspiration.

The accessory expiratory muscles are the abdominal muscles: rectus, abdominis, external oblique, internal oblique and transversus Abdominis.