Muscular System Flashcards
which type of muscle is not striated
smooth muscles
which muscle cell has the largest fiber diameter
skeletal muscle
which is the only muscle cell without a centrally located nuclei
skeletal muscle
which has the largest amount of sarcoplasmic reticulum
skeletal muscle
which muscle cell has no transverse tubules
smooth muscle
which muscle has transverse tubule aligned with z disc
cardiac muscle
which type of muscle has cell junctions
cardiac muscles
what muscle has endomysium, perimysium and epimysium as connective tissue component
skeletal muscle
what are the connective tissue components of cardiac muscles
endomysium and perimysium
what is the connective tissue component of smooth muscles
endomysium
which muscle tissues are striated
cardiac and skeletal tissue
which mucle cell has many nuclei
skeletal muscle
which muscle tissue contract voluntarily
skeletal muscle
what are striations
alternating dark and light bands
refers to the self induced impulse of the cardiac muscles
auto rhythmicity
connective tissue which is the outermost layer of the muscle, present only in skeletal muscle
epimysium
connective tissue that surrounds groups of 10 to 100 or more muscle fibers separating them into bundles
perimysium
a bundle of 10-100 muscle fibers separated by perimysium
fascicles
a thin sheath of areolar connective tissue that penetrates the interior of each fascicle and separates individual muscle fibers from one another, present in all muscles
endomysium
a cord of dense regular connective tissue composed of parallel bundles of collagen fibers that attach a muscle to the periosteum of a bone
tendon
the plasma membrane of a muscle fiber
sarcolemma
cytoplasm of a muscle fiber
sarcoplasm
continually pumps Calcium ions from the sarcoplasm and stores it within its sacs
sarcoplasmic reticulum
allow electrical signals or impulses to move deeper into the cell
T tubules
produces ATP and is most numerous in skeletal muscle tissue
mitochondria
contains thousands of thick and thin myofilaments that extend lengthwise along the skeletal muscle fibers and almost all fill their sarcoplasm
myofibrils
thick filament
myosin
thin filaments
actin, tropomyosin and troponin
when myosin heads bridge the gap between adjacent myofilaments, they are called
cross bridges
basic contractile unit of the muscle cell
sarcomere
narrow plate-shaped regions of dense materials that separate one sarcomere from the next
Z discs
the region in the center of H zone that contains proteins that hold thick filaments together at the center of the sarcomere
M Line
the segment that runs the entire length of the thick filament, and includes parts of thin filament that overlap thick filament
A band
the segment that includes the Z line and the ends of the thin filaments where they do not overlap the thick filaments
I band
narrow region in the center of each A band that contains thick filaments but no thin filaments
H Zone
stabilizes the position of the thick filament and can stretch and spring back due to its size
titin
structural protein that attaches to actin molecules of thin filaments
a actinin
form the m line of the sarcomere, binds to titin
myomesin
long non elastic protein wrapped around each thin filament
nebulin
anchors the muscle fibers to the surrounding matrix, holds the actin filaments to the sarcolemma
dystotrophin
