Question 1

Which muscle is primarily responsible for increasing the volume of the thoracic cavity during inspiration?

Accepted Answer

Diaphragm

Question 2

During forced expiration, which muscle contracts to decrease the size of the rib cage?

Accepted Answer

Internal intercostals

Question 3

A patient is unable to perform lateral flexion and rotation of the trunk. Which muscle group is most likely impaired?

Accepted Answer

Muscles of the abdominal wall

Question 4

Which of the following muscles is NOT innervated by intercostal nerves?

Accepted Answer

Pectoralis major

Question 5

Which muscle acts to protract the scapula, as when pushing against resistance?

Accepted Answer

Serratus anterior

Question 6

If the diaphragm is paralyzed, which physiological process is most directly affected?

Accepted Answer

Inspiration

Question 7

Which muscle is most involved in compressing the abdominal viscera during actions such as defecation or childbirth?

Accepted Answer

Transversus abdominis

Question 8

A patient presents with difficulty retracting the scapula. Which muscle is most likely weakened?

Accepted Answer

Rhomboid major

Question 9

Which of the following best describes the arrangement of the fascicles in the abdominal wall muscles?

Accepted Answer

They run at angles to one another for added strength

Question 10

Which muscle is responsible for elevating the scapula, as when shrugging the shoulders?

Accepted Answer

Trapezius

Question 11

During a forceful cough, which group of muscles is primarily responsible for increasing intra-abdominal pressure?

Accepted Answer

Muscles of the abdominal wall

Question 12

Which muscle forms the central tendon that divides the thoracic and abdominal cavities?

Accepted Answer

Diaphragm

Question 13

A person with a lesion of the long thoracic nerve would most likely have difficulty with which movement?

Accepted Answer

Protracting the scapula

Question 14

Which muscle is most responsible for the downward rotation of the scapula?

Accepted Answer

Rhomboid major

Question 15

Which of the following actions is NOT performed by the muscles of the abdominal wall?

Accepted Answer

Extension of the arm

Question 16

Which muscle is most active during a sit-up exercise?

Accepted Answer

Rectus abdominis

Question 17

Which muscle is responsible for depressing the scapula?

Accepted Answer

Pectoralis minor

Question 18

Which of the following best describes the function of the external intercostal muscles?

Accepted Answer

Elevate the rib cage during inspiration

Question 19

A patient is unable to rotate their trunk to the left. Which muscle is most likely impaired?

Accepted Answer

Right external oblique

Question 20

Which muscle is most responsible for the initial 30 degrees of arm abduction?

Accepted Answer

Supraspinatus

Muscles of the Thorax, Abdominal Wall, and Shoulder: Structure and Function Chapter 10 part 2

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