Chapter 9 Skeletal Muscle Tissue And Muscle Organization Exam 2

Front 1

What are the 4 basic properties of all muscle
tissue (skeletal, cardiac, and smooth)?

Back 1

 Excitability
 Contractility
 Extensibility
 Elasticity

Front 2

What are the 5 basic functions of skeletal
muscle?

Back 2

*Movement (skeletal)
*Posture (maintain it)
*Support (soft tissues, e.g. abdomen)
*Regulate flow (sphincters)
*Maintain temperature

Front 3

What layer of connective tissue surrounds
the entire muscle?

Back 3

Epimysium

Front 4

What layer of connective tissue divides the
muscle into a series of internal
compartments containing a bundle of
muscle fibers and contains blood vessels
and nerves that branch to supply each
bundle of fibers?

Back 4

Perimysium

Front 5

What is the technical term for each of these
bundles of fibers Perimysium?

Back 5

Fascicle

Front 6

What layer of connective tissue surrounds
each muscle fiber, binds each fiber to its
neighbor, and supports capillaries that
supply blood to individual muscle fibers?

Back 6

Endomysium

Front 7

What do we call a thick cord or cable
formed from the convergence of the
connective tissue layers of a muscle that
bind the muscle to bone, skin, or another
muscle?

Back 7

Tendon

Front 8

What do we call this convergence of
connective tissue layers if it takes the form
of a flattened sheet?

Back 8

Aponeurosis

Front 9

What do we call the site of chemical
communication between a nerve and a
skeletal muscle fiber?

Back 9

Neuromuscular junction

Front 10

What is the technical term for the plasma
membrane of a skeletal muscle cell?

Back 10

Sarcolemma

Front 11

What is the name of the deep indentations
of the skeletal muscle cell’s plasma
membrane that extend into the cytoplasm
and carries electrical impulses that stimulate
and coordinate muscle contractions?

Back 11

T-tubules

Front 12

What is the technical term for the structures,
composed of bundles of protein filaments,
that can shorten are therefore responsible
for muscle contraction?

Back 12

Myofibrils

Front 13

What is the name of the repeating unit of
protein fibers in a myofibril?

Back 13

Sarcomere

Front 14

What protein is found in the thick filaments
of a myofibril?

Back 14

Myosin

Front 15

What protein is found in the thin filaments
of a myofibril?

Back 15

Actin

Front 16

At what region do proteins bind thick
filaments at the center of the sarcomere?

Back 16

M-line

Front 17

At what region do proteins bind thin
filaments at the ends of the sarcomere?

Back 17

Z-line

Front 18

What region of the sarcomere contains only
thick filaments (including the m-line)?

Back 18

H-band

Front 19

What region of the sarcomere contains only
thin filaments (continuous between
sarcomeres and includes the z-line)?

Back 19

I-band

Front 20

What region of the sarcomere consists of
the entire region with thick filaments (both
overlapping thick and thin filaments and
only thick filaments)?

Back 20

A-band

Front 21

What do we call all of the muscle fibers
controlled by a single motor neuron?

Back 21

Motor unit

Front 22

What does the size of the motor unit (# of
muscle fibers) tell us?

Back 22

Fewer myofibrils per neuron = greater control

Front 23

What type of muscle fibers are large in
diameter, contain densely packed
myofibrils, have large glycogen reserves,
have few mitochondria, and are prone to
fatigue?

Back 23

Fast fibers

Front 24

What type of muscle fibers are smaller in
diameter, have an extensive capillary
network, contain myoglobin (stores
oxygen), and have many mitochondria?

Back 24

Slow fibers

Front 25

What do we call the attachment site of a
muscle that (generally) remains stationary?

Back 25

Origin

Front 26

What do we call the attachment site of a
muscle that moves during contraction?

Back 26

Insertion

Front 27

What do we call a muscle whose
contraction is mostly responsible for
producing a movement?

Back 27

*Agonist
*Prime Mover

Front 28

What do we call a muscle that assists the
primary muscle in performing a movement?

Back 28

Synergist

Front 29

What do we call a muscle whose actions
oppose those of another muscle?

Back 29

Antagonist