CMP Kinesiology & Biomechanics 2

Question 1

The rotator cuff is composed of which four muscles?

Accepted Answer

Supraspinatus, infraspinatus, teres minor, and subscapularis

Answer

The rotator cuff consists of supraspinatus, infraspinatus, teres minor, and subscapularis — collectively stabilizing the glenohumeral joint.

Question 2

Which type of joint allows rotation around a single axis, as seen in the atlantoaxial joint of the cervical spine?

Accepted Answer

Pivot joint

Answer

A pivot joint, like the atlantoaxial joint, permits rotation around one axis — allowing the head to turn left and right.

Question 3

Pronation of the forearm involves:

Accepted Answer

Rotating the palm to face downward (posteriorly)

Answer

Pronation rotates the radius over the ulna, turning the palm to face downward or posteriorly.

Question 4

Which muscle is the primary wrist flexor located on the medial (ulnar) side of the forearm?

Accepted Answer

Flexor carpi ulnaris

Answer

The flexor carpi ulnaris is the primary wrist flexor on the medial side, originating from the medial epicondyle and inserting on the pisiform.

Question 5

In muscle function terminology, an 'agonist' is best described as:

Accepted Answer

The primary muscle responsible for producing a specific movement

Answer

The agonist (prime mover) is the muscle primarily responsible for producing the desired joint movement.

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