Skeletal Muscle Tissue

Front 1

What are the 3 concentric wrappings of connective tissue of muscle?

Back 1

1. Enodmysium

2. Perimysium

3. Epimysium

Front 2

this type of concentric connective tissue binds fibers to their neighbors and supports the capillaries that supply the fibers

Back 2

Endomysium

Front 3

the muscle fibers bound together by the endomysium form a bundle called a __________.

Back 3

fascicle

Front 4

This connective tissue has fascicles that are surrounded by CT containing collagen and elastic fibers that supports the blood vessels and nerves that serve the fibers of the fascicles.

Back 4

perimysium

Front 5

the entire muscle is surrounded by dense CT that separates the muscle from the surrounding tissue and organs. This is the ____________.

Back 5

epimysium

Front 6

When the attachment of muscle is broad and forms a sheet it is called an _____________

Back 6

aponeurosis

Front 7

Each muscle fiber is also controlled by a nerve that forms a single attachment point with each fiber eat the _______________________.

Back 7

neuromuscular junction

Front 8

skeletal muscle cells develop when hundreds of individual embryonic cells called _____________ fuse.

Back 8

myoblasts

Front 9

the resulting cells' cell membrane from the fused myoblasts is called _______________.

Back 9

sarcoplasm

Front 10

skeletal muscles are very __________

Back 10

large and multinucleate

Front 11

Some myoblasts do not fuse but remain associated with the fiber as ______________ that divide and differentiate to repair damaged cells.

Back 11

satellite cells

Front 12

there are internal tubular extensions of the sarcolemma into the sarcoplasm called _________________.

Back 12

transverse or T tubules

Front 13

within each skeletal muscle cell or fiber there are cylindrical structures called ____________.

Back 13

myofibrils

Front 14

in-between the loops of transverse tubules, there is a network of tubules of smooth endoplasmic reticulum called the ___________________

Back 14

sarcoplasmic reticulum.

Front 15

The sarcoplasmic reticulum on either side of the loops of transverse tubules fuse to form expanded chambers called _______________.

Back 15

terminal cisternae

Front 16

the combination of a transverse tubule flanked by two terminal cisternae is called a _____________

Back 16

triad

Front 17

What surrounded the myofibrils as a ready source of fuel?

Back 17

glycogen granules

Front 18

what are the myofibrils made up of?

Back 18

myofilaments

Front 19

the myofilaments are organized in repeating units along the length of the myofibril called ____________.

Back 19

sarcomeres

Front 20

the primary microfilaments in myofibrils are _______ (thin) and ________ (thick) filaments

Back 20

actin, myosin

Front 21

what is responsible for the banding pattern of the thick and thin filaments?

Back 21

the difference in size and density

Front 22

what can you find in the center of the sarcomere?

Back 22

narrow H band

Front 23

What is the H band in the center of?

Back 23

the A band

Front 24

which band is where the thin filaments do not overlap with the thick filaments at either end of the sarcomere, and straddling the Z line?

Back 24

I band

Front 25

the thick filaments are linked in the center of the sarcomere by proteins that form the _________.

Back 25

M line

Front 26

At either end of the sarcomere, the actin filaments are attache to one another by proteins that form the ________

Back 26

Z line

Front 27

What is the thin filament composed of?

Back 27

G-actin protein molecules that form a linear molecule called F-actin.

Front 28

What holds F-actin together?

Back 28

nebulin

Front 29

What does each G-actin have?

Back 29

an active site that binds to a site on the myosin molecule.

Front 30

What prevents the binding of myosin and the active site?

Back 30

protein called tropomyosin

Front 31

What holds the tropomyosin in position ?

Back 31

troponin

Front 32

What must bind to troponin in order for the position of tropomyosin to change to uncover the binding site and permit the binding of actin and myosin?

Back 32

calcium ions

Front 33

at either end of the sarcomere the actin filaments are attached to the Z line or disc by a protein called ___________.

Back 33

actinin

Front 34

What is the connection of thin filaments and the head myosin head called?

Back 34

cross-bridges

Front 35

the thick filaments are associated with a protein called?

Back 35

titin

Front 36

what does titin do?

Back 36

contributes to the normal alignment of the thick and thin filaments and has elastic properties that restores the sarcomere to its original resting position after being stretched.