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Flashcards in quiz 4 Deck (31):
1

the outermost layer of connective tissue of a muscle is the ____?

fascicle

2

the thick myofibril filament of a sarcomere is composed of the protein ___?

actin

3

the muscle primarily responsible for an action is the ____?

agonist

4

the neuron and the muscle fibers it innervates make up the ___?

muscle fiber

5

the functional contractile unit of a muscle fiber is the _____?

sarcoplasmic reticulum

6

the action of a particular muscle is always the same

t/f

true

7

a synergistic muscle contraction assists the agonist

t/f

false

8

the plasma membrane of a muscle fiber is called the sarcolemma

t/f

true

9

protein that comprises part of the thin filament with actin

troponin

10

cytoplasm of a muscle fiber

sacroplasm

11

connective tissue located between adjacent muscles

fascia

12

layer of connective tissue that separates a muscle into small bundle called fascicle

perimysium

13

plasma membrane of a muscle fiber

sacrolemma

14

layer of connective tissue that surrounds a skeletal muscle

epimysium

15

unit of alternating light and dark striations between Z discs

sacromere

16

layer of connective tissue that surrounds an individual muscle fiber

endomysium

17

cellular organelle in muscle fiber corresponding to the endoplasmic reticulum

sarcoplasmic reticulum

18

cordlike part that attaches a muscle to a bone

tendon

19

protein found within thick filament

myosin

20

small bundle of muscle fibers within a muscle

fascicle

21

the ____ of a muscle is attached to a more fixed location

origin

22

the ______ of a muscle is attached to a more movable location

insertion

23

a muscle responsible for most of an action is called an

against (prime mover)

24

assisting muscles of an agonist are called

synergists

25

antagonists are muscles that resist the actions of ____ and cause movement in the opposite direction

prime movers

26

when the forearm is extended at the elbow joint, the ______ muscle acts as the agonist

triceps brachii

27

when the brachialis acts as the agonist, the ___ muscle assists as a synergist

antagonist

28

a _______ is a synergistic muscle that will stabilize a joint when another contracting muscle exerts a force on something else

fixator

29

electrical activity of muscles and the action potential propagated along the sacrolemma

EMG electrodes

30

when there is demand to stimulate more motor units within a muscle to help it contract as a load increases

motor unit recruitment

31

a recording of skin-surface voltage that is produced by underlying skeletal muscle contractions

electromyography