Chapter 11

Which of the following may be the basis for the name of a muscle?

The direction of the muscle's fasicles

The size of the muscle

The action of the muscle

The location of the muscle

All of the above may be used to name a muscle

A prime mover (agonist)

Is the muscle most responsible for a particular action

Is opposed by contraction of a synergist

Is destabilized by contraction of a fixator

Is assisted by contraction of an antagonist

All of the above are correct

Intramuscular injections are usually given

When medications must be absorbed more slowly than possible through oral administration

In the gluteus maximus of an adult

In the vastus lateralis of a child

Is the biceps brachii of an adolescent

When medications must be absorbed more quickly than possible through I.V administration

Fascicle arrangements

Are named based on their orientation with the tendon of the muscle

Affect the power of the muscles

Affect the range of motion of muscles

A and b are correct

A, b, and c are correct

A third class lever

Is the most common lever system in the human body

May be represented as FLE

Always produce a mechanical advantage

Favors force over speed

Favors force over range of motion

A first class lever

May be represented as FEL

Extends a bowed head on the vertebral column

Allows a ballerina to stand on her toes

Allows the forearm to flex on the arm

Is the least common lever system in the body

A lever

Is a rigid structure that moves about a fixed point

Provides mechanical advantage when a small effort can move a large load

That provides a mechanical advantage decreases the speed and distance needed to move a load

A and b are correct

A, b, and c are correct

Which of the following is true?

The origin of a muscle on a limb is usually proximal to it insertion

A muscle must cover the limb or other body part it moves

Muscles crossing one joint have more complex actions than those crossing two joints

A and b are correct

A, b, and c are correct

Which of the following is true?

Muscles pull on bones; they do not push bones

The end of the muscle attached to the bone that moves least is the origin of that muscle

The end of the muscle attached to the bone that moves most is the insertion of the muscle

The main movement that occurs when the muscle contracts is the action of the muscle

All of the above are correct

Chapter 11

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