Muscular System

The majority of lower extremity functional activity occurs in a closed chain manner.

• True

• False

The ability of a muscle to recoil or return to normal resting length after a stretching or shortening force is removed is called

• irritability.

• contractility

• elasticity.

• extensibility

A contraction that causes no joint movement while producing muscle fiber tension is

• ISOK

• ISOT

• ISOM

• Eccentric

The deltoid muscle can effectively contract through its entire ROM because of the upward rotation of the scapula, which serves to maintain tension in the deltoid muscle. If the deltoid loses tension, it becomes

• passive insufficient

• actively insufficient

• noncontractile

• none of these

What is the term for a muscle contraction in which the proximal end moves toward the distal end?

• irritability

• extensibility

• reversal of muscle action

• active insufficiency

Which of the following is a true statement regarding oblique muscle fibers?

• Oblique muscle fibers tend to be longer than parallel fibers, thus having more strength potential than parallel fibers

• Oblique muscle fibers tend to be longer than parallel fibers, thus having less strength potential than parallel fibers

• Oblique muscle fibers tend to be shorter than parallel fibers, thus having more strength potential than parallel fibers

• Oblique muscle fibers tend to be shorter than parallel fibers, thus having less strength potential than parallel fibers

You can make a tighter fist with your wrist extended than with your wrist flexed because of

• active insufficiency of the finger flexors

• active insufficiency of the finger extensors.

• passive insufficiency of the finger flexors.

• passive insufficiency of the finger extensors

If a person threw a Frisbee and wanted wrist radial deviation, which muscle group would be the antagonist?

• Wrist radial deviators

• Wrist ulnar deviators

• Wrist flexors

• Wrist extensors

Which of the following is NOT true of an eccentric contraction?

• Contraction produces a greater force than a concentric contraction.

• Contraction is used as an acceleration activity.

• Muscle attachments move farther apart.

• Movement occurs with gravity

The type of muscle contraction that occurs with fixed speed, fixed resistance, and no joint motion is

• ISOK

• ISOM

• ISOT

• Tenodesis