Massage Therapist Kinesiology 5

Question 1

Which muscle group is responsible for lateral flexion of the trunk?

Accepted Answer

Quadratus lumborum

Answer

The quadratus lumborum is a primary lateral flexor of the trunk, also assisting in hip elevation and lumbar extension.

Question 2

What type of lever system is most common in the human body?

Accepted Answer

Third-class lever

Answer

Third-class levers are most common in the body; the effort (muscle) is between the fulcrum (joint) and the load, producing speed and range of motion.

Question 3

Scapular upward rotation is primarily produced by which muscles working together?

Accepted Answer

Serratus anterior and upper/lower trapezius

Answer

Upward rotation of the scapula is produced by a force couple between the serratus anterior and the upper and lower fibers of the trapezius.

Question 4

Which term describes a movement that decreases the joint angle between two bones?

Accepted Answer

Flexion

Answer

Flexion decreases the angle between bones at a joint, such as bending the elbow or knee.

Question 5

The pectoralis major performs which action at the glenohumeral joint?

Accepted Answer

Shoulder horizontal adduction and medial rotation

Answer

The pectoralis major performs horizontal adduction and medial (internal) rotation of the humerus at the glenohumeral joint.

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