Question 1

Which of the following is a true statement regarding oblique muscle fibers?&#10;A) Oblique muscle fibers tend to be longer than parallel fibers,thus having more strength potential than parallel fibers.&#10;B) Oblique muscle fibers tend to be longer than parallel fibers,thus having less strength potential than parallel fibers.&#10;C) Oblique muscle fibers tend to be shorter than parallel fibers,thus having more strength potential than parallel fibers.&#10;D) Oblique muscle fibers tend to be shorter than parallel fibers,thus having less strength potential than parallel fibers.

Accepted Answer

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

Question 2

A contraction that causes no joint movement while producing muscle fiber tension is&#10;A) ISOK.&#10;B) ISOT.&#10;C) ISOM.&#10;D) eccentric.

Accepted Answer

ISOM stands for isometric, which means that the contraction produces muscle fiber tension without causing any joint movement.

Question 3

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

A) passively insufficient.
B) actively insufficient.
C) noncontractile.
D) None of the above

actively insufficient.

Accepted Answer

If the deltoid loses tension, it will not be able to contract effectively through its entire ROM, leading to a situation of active insufficiency. Passively insufficient refers to a situation where the muscle cannot be lengthened enough to allow for full ROM, while noncontractile refers to a muscle that is no longer able to contract. None of these situations apply to this scenario.

Question 4

The majority of lower extremity functional activity occurs in a closed chain manner.&#10;Multiple Choice&#10;Identify the choice that best completes the statement or answers the question.

Accepted Answer

Closed chain exercises involve weight-bearing activities where the foot or hand is fixed to the ground or an immovable object, such as squats or push-ups. These activities are essential in rehabilitation, sports conditioning, and activities of daily living.

Question 5

The ability of a muscle to respond to a stimulus is referred to as which of the following?&#10;A) Irritability&#10;B) Contractility&#10;C) Extensibility&#10;D) Elasticity

Accepted Answer

Irritability (also known as excitability) is the ability of a muscle to respond to a stimulus, such as a nerve impulse. Contractility refers to the ability of a muscle to contract and generate force. Extensibility is the ability of a muscle to stretch without being damaged, while elasticity is the ability of a muscle to return to its original shape after being stretched or contracted.

Question 6

If a person threw a Frisbee and wanted wrist radial deviation,which muscle group would be the antagonist?&#10;A) Wrist radial deviators&#10;B) Wrist ulnar deviators&#10;C) Wrist flexors&#10;D) Wrist extensors

Accepted Answer

Wrist ulnar deviators act as the antagonist to wrist radial deviation because they perform the opposite motion, moving the wrist towards the ulnar side, whereas radial deviation involves moving the wrist towards the radial side.

Question 7

You can make a tighter fist with your wrist extended than with your wrist flexed because of&#10;A) active insufficiency of the finger flexors.&#10;B) active insufficiency of the finger extensors.&#10;C) passive insufficiency of the finger flexors.&#10;D) passive insufficiency of the finger extensors.

Accepted Answer

Active insufficiency occurs when a muscle cannot contract any further due to its length being too short. In this case, with the wrist flexed, the finger flexor muscles are already shortened, limiting their ability to contract further and make a tight fist. With the wrist extended, the finger flexors are in a more optimal position to generate force and make a tighter fist.

Question 8

The type of muscle contraction that occurs with fixed speed,fixed resistance,and no joint motion is&#10;A) ISOK.&#10;B) ISOM.&#10;C) ISOT.&#10;D) tenodesis.

Accepted Answer

The type of muscle contraction described - fixed speed, fixed resistance, and no joint motion - is an isometric contraction. Therefore, the best choice is option B, ISOM.

Question 9

Which of the following is NOT true of an eccentric contraction?&#10;A) Contraction produces a greater force than a concentric contraction.&#10;B) Contraction is used as an acceleration activity.&#10;C) Muscle attachments move farther apart.&#10;D) Movement occurs with gravity.

Accepted Answer

Eccentric contractions are characterized by the muscle lengthening under tension, often acting to decelerate a movement rather than accelerate it. Choices A, C, and D accurately describe aspects of eccentric contractions, but B does not, as eccentric contractions are typically associated with deceleration activities, not acceleration.

Question 10

What is the term for a muscle contraction in which the proximal end moves toward the distal end?&#10;A) Irritability&#10;B) Extensibility&#10;C) Reversal of muscle action&#10;D) Active insufficiency

Accepted Answer

The term for a muscle contraction in which the proximal end moves toward the distal end is reversal of muscle action. This can occur in muscles that attach to both a proximal and distal structure, such as the biceps brachii muscle during wrist extension.

Question 11

Which of the following is NOT true of a concentric contraction?&#10;A) Muscle attachments move closer together.&#10;B) This type of contraction produces less of a force than an eccentric contraction.&#10;C) Movement occurs against gravity.&#10;D) A concentric contraction is an acceleration activity.

Accepted Answer

The answer of Which of the following is NOT true...

Question 12

The ability of a muscle to recoil or return to normal resting length after a stretching or shortening force is removed is called&#10;A) irritability.&#10;B) contractility.&#10;C) elasticity.&#10;D) extensibility.

Accepted Answer

The answer of The ability of a muscle to recoil...

Deck 5: Muscular System