OSMT (Ontario Society of Medical Technologists) Practice Exam

Which statement is NOT true of muscle locations and functions?

1. a. The deltoid is the shoulder muscle that adducts the arm

2. b. The quadriceps femoris group is on the front of the thigh and extends the lower leg

3. c. The triceps brachii extends the forearm: its antagonist is the biceps brachii

4. d. The rectus abdominus is on the front of the abdomen and flexes the vertebral column

The correct answer is: a. The deltoid is the shoulder muscle that adducts the arm

The correct answer is based on the role of the deltoid muscle in arm movement. The deltoid is primarily responsible for abduction of the arm, particularly when the arm is raised above head level. While it may assist in adduction during certain movements, it is not accurate to categorize its primary function as adducting the arm. The other statements accurately describe the respective muscles: the quadriceps femoris indeed extends the lower leg, the triceps brachii extends the forearm with the biceps brachii as its antagonist, and the rectus abdominus flexes the vertebral column while being located on the front of the abdomen.