QuestionSBA
QuestionChoice
This answer is incorrect. Serratus anterior is involved in forced inspiration, where it elevates the ribcage.
10007298
c
Serratus anterior
QuestionChoice
This answer is incorrect. The scalenes are involved in forced inspiration to elevate the upper ribs.
10007297
b
Scalenes
QuestionChoice
This answer is correct. The rectus abdominis is involved in forced expiration to raise intra-abdominal pressure and elevate the diaphragm.
10007296
a
Rectus abdominis
QuestionChoice
This answer is incorrect. Latissimus dorsi is involved in forced inspiration, where it elevates the lower ribs.
10007299
d
Latissimus dorsi
QuestionChoice
This answer is incorrect. Sternocleidomastoid is involved in forced inspiration, where it elevates the lower ribs.
10007300
e
Sternocleidomastoid
Concept
Chapter
2693
4584
The role of the chest muscles in breathing
Topic
150
Respiratory physiology
14006
A 74-year-old man attends the emergency department with an exacerbation of COPD. He is dyspnoeic and unable to talk in full sentences. On examination, it is noted that he is using accessory muscles to breathe.

Which of the following muscles is involved in forced expiration?
a