Chapter 7- Myology Part II Flashcards Preview

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Flashcards in Chapter 7- Myology Part II Deck (48)
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1

The distribution of muscle fibres; most muscles are a mix of SO, FOG, FG Fibres within a given motor unit, all Fibres are the same type. T/F

True

2

A motor unit consist of a --------------motor neuron plus all of the muscle fibres it stimulates.

somatic

3

When the AP travels down the motor neuron to the muscles fibres e.g motor unit) , all fibres in that motor unit will generate force. T/F

True

4

Not all motor unite are recruited with every contraction. T/F

True

5

All motor units are recruited for a given action do not contract ATPH the same time . T/F

True

6

Smalles/weakest motor unit are recruited first. T/F

True

7

Precise movements require small changes in muscle contraction. T.F

True

8

Muscles that perform fine movements will be made up of small motor units (few muscle fibers/ motor unit). T/F

True

9

Large (imprecise) movements do not require small changes in muscle contraction - theory typically require large amount of tension. T/F

True

10

Muscles that perform gross movements will be made up of large motor units (many muscle fibres/motor unit). T/F

True

11

What is the gradation of force?

To increase the amount of force generated

12

To increase the amount of force generated, it depends on;
1.-----------------------
2.-----------------------

1. increase the number of motor units recruited
2. increase the frequency of normal AP firing (wave summation)

13

The forcefulness of muscle contraction , it is the ability -----------, and it depends on the length of the ------------within the muscle before the contraction begin.

to generate force
Sarcomere

14

it is at the greatest ability to I generate muscle tension called -------------

Optimal Overlap (resting length)

15

Decreased ability to generate muscle tension called-------

minimal overlap (lengthened)

16

Decrease ability to generate tension

excessive overlap

17

muscle contraction through a range against resistance that is not changing called ---------------

Isotonic (same tone)

18

A shortening contraction called -----------

concentric

19

A lengthening contraction called ----------

eccentric

20

muscle contraction in which the length of the muscle does not visibly change called---------

eccentric

21

muscle contraction through a range in which the the equipment varies the resistance to match the strength curve called ----------

Variable Resistance

22

muscle contraction through a range in which the the equipment keeps the velocity of movement constant called ----------

Isokinetic

23

A small amount of tension being generated in the muscle and not strong enough to produce movement called --------

Resting tone/muscle tone

24

A brief contraction of all the muscle fibres in a motor unit to a single AP in its motor neuron called ------------------

Twitch contraction / Involuntary

25

A lack of tone ( Atonic) from the nerve being damaged or cut called -------

Flaccidity

26

Increase in muscle size ( increase Myofibrils & increase Sarcomere ) called -----------

Hypertrophy

27

decrease in muscle size called ----------

Atrophy

28

The inability of a muscle to function at the required level due to an energy substrate depletion, metabolic -by product, neurological fatigue, central nervous system fatigue called ------------------

Fatigue

29

The regeneration of muscle tissue occurs by undifferentiated muscle cell, limited capacity , and actively involved in muscle repairs and generation called ------------

Satellite cells

30

Surrounds the entire muscle called --------

epimysium