quiz 4

Question 1

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

Answer 1

fascicle

Question 2

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

Answer 2

actin

Question 3

the muscle primarily responsible for an action is the ____?

Answer 3

agonist

Question 4

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

Answer 4

muscle fiber

Question 5

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

Answer 5

sarcoplasmic reticulum

Question 6

the action of a particular muscle is always the same

t/f

Answer 6

true

Question 7

a synergistic muscle contraction assists the agonist

t/f

Answer 7

false

Question 8

the plasma membrane of a muscle fiber is called the sarcolemma

t/f

Answer 8

true

Question 9

protein that comprises part of the thin filament with actin

Answer 9

troponin

Question 10

cytoplasm of a muscle fiber

Answer 10

sacroplasm

Question 11

connective tissue located between adjacent muscles

Answer 11

fascia

Question 12

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

Answer 12

perimysium

Question 13

plasma membrane of a muscle fiber

Answer 13

sacrolemma

Question 14

layer of connective tissue that surrounds a skeletal muscle

Answer 14

epimysium

Question 15

unit of alternating light and dark striations between Z discs

Answer 15

sacromere

Question 16

layer of connective tissue that surrounds an individual muscle fiber

Answer 16

endomysium

Question 17

cellular organelle in muscle fiber corresponding to the endoplasmic reticulum

Answer 17

sarcoplasmic reticulum

Question 18

cordlike part that attaches a muscle to a bone

Answer 18

tendon

Question 19

protein found within thick filament

Answer 19

myosin

Question 20

small bundle of muscle fibers within a muscle

Answer 20

fascicle

Question 21

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

Answer 21

origin

Question 22

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

Answer 22

insertion

Question 23

a muscle responsible for most of an action is called an

Answer 23

against (prime mover)

Question 24

assisting muscles of an agonist are called

Answer 24

synergists

Question 25

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

Answer 25

prime movers

Question 26

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

Answer 26

triceps brachii

Question 27

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

Answer 27

antagonist

Question 28

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

Answer 28

fixator

Question 29

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

Answer 29

EMG electrodes

Question 30

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

Answer 30

motor unit recruitment

Question 31

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

Answer 31

electromyography