QuestionSBA
QuestionChoice
The sternocleidomastoid muscle attaches to the manubrium and clavicle and helps elevate the sternum during inspiration. This increases the length of the thoracic cavity, allowing for greater expansion of the lungs, and increasing gaseous exchange.
10023670
a
Sternocleidomastoid muscle
QuestionChoice
The posterior scalene muscle attaches to the inner border of the second rib, elevating it during inspiration. The sternocleidomastoid muscle elevates the sternum during inspiration.
10023672
c
Posterior scalene muscle
QuestionChoice
The diaphragm is located at the bottom of the ribcage, not connecting to the sternum at any point, and is dome-shaped. During inspiration, the dome descends, thus increasing the vertical dimension of the thoracic cavity.
10023674
e
Diaphragm
QuestionChoice
The external intercostal muscles elevate the ribs during inspiration, causing an increase in thoracic cavity width. The sternocleidomastoid muscle elevates the sternum during inspiration.
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d
External intercostal muscles
QuestionChoice
The anterior scalene muscle attaches to the inner border of the first rib and elevates it during inspiration. The sternocleidomastoid muscle elevates the sternum during inspiration.
10023671
b
Anterior scalene muscle
Concept
Chapter
2693
3778
The role of chest muscles in breathing
Topic
150
Respiratory physiology
17132
An 86-year-old male is being observed breathing by the medical team on the respiratory ward. It is noted that he is using his accessory muscles to breathe, which is concerning the medical team.

What accessory muscle elevates the sternum during inspiration?
a