Muscle

Question 1

skeletal muscle structure

Answer 1

striated, long multinucleated peripheral nuclei, voluntary contraction, parallel fibers with no branching, sarcomere units defined by Z lines

Question 2

cardiac muscle structure

Answer 2

striated, branched, round central mononuclear nuclei, intercalated disks mark units, forms the myocardium, has purkinjie fibers

Question 3

smooth muscle structure

Answer 3

unstriated, looks similar to dense regular connective tissue, cells are spindle shaped with numerous central cigar shaped mononuclear nuclei

Question 4

A band

Answer 4

dark staining thick band, thin filaments overlap thick filaments

Question 5

H band

Answer 5

zone of pale staining in the center of the A band, no overlap

Question 6

I band

Answer 6

zone of thin filaments that do not overlap thick filaments

Question 7

Z line

Answer 7

dark band in the center of the I band, define sarcomeres

Question 8

M line

Answer 8

line down the center of the H band

Question 9

compare skeletal and smooth muscle

Answer 9

skeletal is striated with long multinuclear peripheral nuclei and parallel fibers, smooth is unstriated, looks similar to dense regular connective tissue, cells are spindle shaped with mononuclear cigar shaped nuclei

Question 10

purkinjie fibers

Answer 10

usually occur in bundles and are part of the conducting system of the heart. they stain lighter due to increased glycogen, often found in groups of 2 or 3

Question 11

sarcoplasm

Answer 11

muscle cell cytoplasm

Question 12

sarcolemma

Answer 12

muscle cell membrane

Question 13

sarcoplasmic reticulum

Answer 13

endoplasmic reticulum of muscle cells for transport, synthesis, storage, and packaging

Question 14

actin

Answer 14

thin unit

Question 15

myosin

Answer 15

thick unit

Question 16

epimysium

Answer 16

surrounds the whole muscle

Question 17

perimysium

Answer 17

subdivides muscle into bundles to form fascicles

Question 18

satellite cells

Answer 18

resident population of muscle precursor cells, form new muscle cells after damage

Question 19

accessory proteins

Answer 19

actinin, myomesin, connectin, desmin, C protein

Question 20

actinin

Answer 20

holds actin filaments in a lattice arrancement in the Z disc

Question 21

actinin

Answer 21

holds actin filaments in a lattice arrancement in the Z line

Question 22

myomesin

Answer 22

hold myosin in a lattice arrangement in the M line

Question 23

connectin

Answer 23

links ends of the tick filaments to the Z line

Question 24

desmin

Answer 24

link myofibrils to the cell membrane and links adjacent myofibrils to each other

Question 25

C protein

Answer 25

myosin binding protein

Question 26

desmosomal junction

Answer 26

link adjacent cells with intermediate filament anchors

Question 27

adherent junctions

Answer 27

anchors actin fibers of the sarcomere to each end of the cell

Question 28

gap junctions

Answer 28

for communication and help synchronize muscle contraction

Question 29

actinin

Answer 29

holds actin filaments in a lattice arrangement in the Z line