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Flashcards in Muscular Contractions Deck (18)
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1
Q

Which of the following is the definition of a concentric muscle contraction?

A

When a muscle is contracting and its attachments to bone are pulled closer together because of the muscle contraction

2
Q

Which of the following is the definition of a eccentric muscle contraction?

A

When a muscle is contracting and its attachments to bone are pulled farther apart by an external force or the momentum of a rotating body segment

3
Q

Which of the following is the definition of an isometric muscle contraction?

A

When a muscle is contracting and its attachments to bone do not move relative to each other

4
Q

Muscles that create joint torques that causes a joint to rotate are functioning in the ___ role?

A

Agonist (these muscles perform concentric muscular contractions)

5
Q

Muscles that create joint torque that oppose the joint rotation are functioning in the ___ role?

A

Antagonist

6
Q

Antagonist

A

-can be used in reference to a joint action
-may also be used in reference to another muscle
oppose joint rotation

7
Q

Muscles that create opposing joint torques in order to keep a joint from rotating are functioning in the ___ role?

A

Stabilizer (keeps unwanted movement at the joint from occurring)
keeps joint from rotating

8
Q

Muscles that create joint torques that eliminate an undesired joint rotation caused by the agonist muscles are functioning in the ___ role?

A

Neutralizer

Eliminate undesired joint rotation

9
Q

Neutralizer

A

-oppose unwanted movement (eg. forearm supination or shoulder flexion)

10
Q

Which of the following muscles is an antagonist to the actions of biceps femoris?

A

any knee extensor (biceps femoris is a knee flexor)

11
Q

According to the muscle force-length relationship, the ability to generate muscle tension is greatest when a muscle is stretched to which of the following conditions?

A

Maximum muscle force is also dependent on the length of the muscle

120% of resting length

12
Q

10 According to the muscle force-velocity relationship, which type of muscle contraction creates the largest muscle forces?

A

Maximum tensile force developed by a muscle is dependent on the velocity of shortening as well as its length

eccentric muscle contractions

13
Q

A muscle in which the muscle fibers and the line of pull of the muscle are in the same direction” is the definition of which of the following types of muscles?

A

Longitudinal Fiber Orientations

14
Q

To propel yourself into the air for a vertical jump what kind of muscle contraction is used at the hip to speed the body up?

A

Concentric hip extension torques

15
Q

When landing after a vertical jump what kind of muscle contraction is used at the knee to slow the body down?

A

Eccentric knee extension torques

16
Q

When when you are running, which of the following muscular contraction(s) can be used to speed you up?

A

concentric hip extension, knee extenstion, and ankle plantar flexion

17
Q

When riding a bicycle, which of the following muscular contractions can be used to speed the bicycle up?

A

concentric ankle plantar flexion torque, concentric ankle dorsiflexion torque, concentric knee extension torque, concentric knee flexion torque, concentric hip extension torque, concencentric hip flexion torque

18
Q

When you are performing the front crawl simming technique, which of the following muscular contractions can be used to speed you up?

A

concentric shoulder adduction torque, concentric elbow flexion torque, concentric elbow extension torque