Skeletal Muscle Key Terms

Question 1

Reverse

Structural protein of muscle that works with myosin to produce muscle contraction

Answer 1

Actin

Question 2

Reverse

Occurs when a muscle is activated and shortens

Answer 2

Concentric Action

Question 3

Reverse

Isotonic muscle contraction

Answer 3

Dynamic

Question 4

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inner layer of connective tissue surrounding a muscle fiber

Answer 4

endomysium

Question 5

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depolarization of a membrane by a sodium influx

Answer 5

end plate potential (EPP)

Question 6

Reverse

outer layer of connective tissue surrounding a muscle fiber

Answer 6

epimysium

Question 7

Reverse

Muscles that extend a limb

Answer 7

extensors

Question 8

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Small bundle of muscle fiers

Answer 8

fascicle

Question 9

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Called type II fibers, low oxadative capacity but high glycolytic capacity

Answer 9

fast-twitch fibers

Question 10

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Muscles that cause flexion of a muscle

Answer 10

flexors

Question 11

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Type IIa fibers, generates high force with moderatly fast speed of contraction

Answer 11

intermediate fibers

Question 12

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Muscle develops tension, does not shorten or extend

Answer 12

isometric contraction

Question 13

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see terminal cisternae

Answer 13

lateral sac

Question 14

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Somatic neuron that innervates skeletal muscle

Answer 14

motor neurons

Question 15

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describes a muscle movement

Answer 15

muscle action

Question 16

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portion of muscle that contains thin and thick contractile filaments

Answer 16

myofibrils

Question 17

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contractile protein in thick filament of myofibril that binds actin and splits ATP to cause tension development

Answer 17

myosin

Question 18

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synapse between axon terminal of a motor neuron and motor end plate

Answer 18

neuromusclular junction

Question 19

Reverse

connective tissue surrounding the fasciculus of muscle fibers

Answer 19

perimysium

Question 20

Reverse

cell membrane surrounding muscle fiber

Answer 20

sarcolemma

Question 21

Reverse

repeating contractile unit in myofibril bounded by Z lines

Answer 21

sarcomeres

Question 22

Reverse

membranous structure that surrounds the myofibrils of a muscle cell

Answer 22

sarcoplasmic reticulum

Question 23

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undifferentiated cell found adjacent to skeletal muscle fibers

Answer 23

satellite cells

Question 24

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theory of muscle contraction describing the sliding of thin filaments (actin) past thick filaments (myosin)

Answer 24

sliding filament model

Question 25

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muscle fiber that contracts slowly and develops low tension

Answer 25

slow-twitch fibers

Question 26

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repeated stimulation of a muscle that leads to an increase in tension

Answer 26

summation

Question 27

Reverse

a

Answer 27

swinging lever-arm model

Question 28

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portion of SR near transverse tubule containing Ca++, also called Later Sac

Answer 28

terminal cisternae

Question 29

Reverse

highest tension developed by muscle in response to high frequency of stimulation

Answer 29

tetanus

Question 30

Reverse

conducts action potential into muscle to deploraize the terminal cisternae

Answer 30

transverse tubules

Question 31

Reverse

protein covering actin-binding sites that prevent myosin cross-bridge from touching actin

Answer 31

tropmyosin

Question 32

Reverse

protein that binds Ca++ and initiates movement of tropmyosin on actin to allow mysoin cross-bridge to touch actin

Answer 32

troponin

Question 33

Reverse

tension-generating response following application of single stimulus to muscle

Answer 33

Twitch

Question 34

Reverse

Contain large number of oxadative enzymes and are highly fatigue resistant

Answer 34

Type I fibers

Question 35

Reverse

contain biochemical and fatigue characteristics between type IIb and type I fibers

Answer 35

Type IIa fibers

Question 36

Reverse

a

Answer 36

Type IIx fibers