Joints, Muscle Actions, and Basic Body Movements

The articulation between the humerus and the ulna is an example of which type of joint?

• Ball and socket

• Condyloid

• Hinge

• Pivot

An injury to the shoulder joint would impact which type of joint?

• Ball and socket

• Hinge

• Plane

• Saddle

The agonist, or prime mover, is responsible for —

• causing a specific muscle to move a bone

• immobilizing the muscle's origin

• support a specific action

• opposing a movement

As the biceps brachii flexes the elbow, brachioradialis assists in this movement. Which term best describes the role of the brachioradialis?

• Agonist

• Antagonist

• Fixator

• Synergist

What is the role of the fixator during muscle contraction?

• Contributes most of the force in a movement

• Aids in part of the action of the contraction

• Stabilizes the joint during a movement

• Opposes the prime mover's action

The biceps brachii contracts, and its attachment to the scapula does not move. This attachment on the scapula is best considered an—

• agonist

• insertion

• origin

• synergist

The triceps brachii opposes the action of the biceps brachii. What is the role of the triceps brachii?

• Antagonist

• Fixator

• Prime mover

• Synergist

As the knee is extended, the quadriceps muscles provide most of the force of the action. The quadriceps muscle is an example of a/an—

• antagonist

• fixator

• prime mover

• synergist

Which exercise best demonstrates the movement of abduction?

• Bending of the elbow joint

• Twisting the trunk from side to side

• Performing a lateral leg lift

• Lifting the toes off the floor

When a patient lifts their toes and forefoot off of the floor, which movement is demonstrated?

• Adduction

• Dorsiflexion

• Flexion

• Rotation