Muscle Tissue

Front 1

Muscle Fibers

Back 1

AKA- Skeletal muscle cells. Composes the skeletal muscle.

Front 2

Fascicles

Back 2

Groups of muscle fibers. Covered by epimysium.

Front 3

Epimysium

Back 3

a sheath of fibrous elastic tissue surrounding a muscle. (Epi- (means upon) (entire, whole muscle)

Front 4

Root mysium

Back 4

muscle

Front 5

Endomysium

Back 5

the delicate connective tissue surrounding the individual muscular fibers within the smallest bundles (a muscle fiber/cell)

Front 6

Fascia

Back 6

a thin sheath of fibrous tissue enclosing a muscle or other organ.

Front 7

Sarcolemma

Back 7

Plasma membrane wrapped around skeletal muscle fibers.

Front 8

Sarcoplasm

Back 8

the cytoplasm of striated muscle cells

Front 9

Myofibrils

Back 9

any of the elongated contractile threads found in striated muscle cells

Front 10

Sarcoplasmic Reticulum

Back 10

(SR) the endoplasmic reticulum (ER) of cardiac muscle and skeletal striated muscle that functions especially as a storage and release area for calcium.

Front 11

Tendon

Back 11

a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.

Front 12

A band

Back 12

Any of various dark-staining anisotropic cross striations in the myofibrils of muscle fibers.

Front 13

I band

Back 13

A pale band of actin on each side of the Z line of a striated muscle fiber.

Front 14

Z Disk/Z line

Back 14

A dark thin protein band to which actin filaments are attached in a striated muscle fiber, marking the boundaries between adjacent sarcomeres.

Front 15

Triad

Back 15

The transverse tubule, and the terminal cisternae on each side of it, in a skeletal muscle fiber.

Front 16

Sphincters

Back 16

(circular muscles) a ring of muscle surrounding and serving to guard or close an opening or tube, such as the anus or the openings of the stomach.

Front 17

Terminal cisternae

Back 17

enlarged areas of
the sarcoplasmic
reticulum
surrounding the transverse
tubules.

Front 18

T-tubule

Back 18

A T-tubule (or transverse tubule)
is a deep invagination of the
sarcolemma, which is the plasma
membrane of skeletal muscle and
cardiac muscle cells. These
invaginations allow depolarization of
the membrane to quickly penetrate to
the interior of the cell.

Front 19

Myofilaments

Back 19

the filaments of
myofibrils constructed from proteins.
The principal types of muscle are
striated muscle, obliquely striated
muscle and smooth muscle. Various
arrangements of myofilaments create different
muscles. Striated muscle has transverse bands
of filaments.

Front 20

Thick filament

Back 20

consist primarily of
the protein myosin.
Each thick filament is
approximately 15 nm in
diameter, and each is made of
several hundred molecules of
myosin

Front 21

Thin filament

Back 21

Thin filaments, 7 nm in
diameter, consist primarily of
the protein actin.

Front 22

Skeletal Muscle

Back 22

Striated, voluntary

Skeletal muscle fibers are long and thin. Each skeletal muscle fiber has multiple nuclei located next to the sarcolemma.

Front 23

Cardiac Muscle

Back 23

Striated, non-voluntary

Cardiac myoctes are short, wide, and branching. Cardiac myocytes usually have a single, large nucleus located among the myofibrils. The intercalated disk of cardiac muscle tissue appear as black lines oriented parallel to the striations.

Front 24

Smooth Muscle

Back 24

Non-striated, non-voluntary.

(lack T-tubules)

Smooth muscle cells are thin and flat. Nucleus is usually in the middle of the cell. Smooth muscle tissue is typically found on a slide with other types of tissue because it lines hollow organs.

Front 25

Perimysium

Back 25

sheath of
connective tissue that groups
muscle fibers into bundles (anywhere
between 10 to 100 or more) or fascicles. (group of muscle fiber cells called fasicle

Front 26

Striations

Back 26

refers to the stripe-like visual features found in skeletal and cardiac muscle.

Front 27

Titin

Back 27

A very large fibrous protein that connects thick myosin filaments to Z discs in the sarcomere.

The elasticity of skeletal muscle fibers is primarily due to the presence of this protein

Front 28

Neuromuscular Junction

Back 28

A neuromuscular junction is a synapse between a motor neuron and skeletal muscle. This lesson describes the events of synaptic transmission leading to contraction of skeletal muscle.

Front 29

After the power stroke has occurred during skeletal muscle contraction, what must occur in order for the acto-myosin cross-bridge to be released?

Back 29

ATP must bind with the myosin head

Front 30

Smooth muscle is capable of mitosis and hyperplasia

Back 30

True

Front 31

The ability of the muscle cell membrane to respond to stimuli with electric changes is known as

Back 31

excitability

Front 32

The ability of the muscle cell to stretch under tension is known as

Back 32

extensibility

Front 33

The ability of the muscle cell to return to its initial length after being stretched is called

Back 33

elasticity

Front 34

Which of the following is a regulatory protein of muscle?

Back 34

tropomyosin

Front 35

Elastic filaments are composed of

Back 35

titin

Front 36

The segment from one Z disc to the next is called a(n)

Back 36

sarcomere

Front 37

The resting membrane potential (RMP) for a skeletal muscle cell is

Back 37

-90mV

Front 38

Neuromuscular junction steps

Back 38

1) action potential comes down and causes vesicles to release ACh into synaptic cleft

2) ACh binds to Na channels

3) Na goes through Na channels

4) Na causes an action potential to form in the muscle

5) AChE recycles ACh and the process starts again with a new action potential

Front 39

One nerve fiber and all the muscle fibers it innervates are collectively called a:

Back 39

motor unit

Front 40

synaptic vesicles

Back 40

store
various neurotransmitters that
are released at the synapse.
The release is regulated by a
voltage-dependent calcium
channel. Vesicles are essential
for propagating nerve impulses
between neurons and are
constantly recreated by the
cell.