Muscle Flashcards
the contractile organelles of skeletal muscle fiber are ________, which are composed of repeating units called _________
myofibrils, sarcomeres
skeletal mm contraction is triggered to begin when calcium is released from
terminal cisterns of sarcoplasmic reticulum
which region of a sarcomere contain thin filaments
both I and A band
myofibrils does NOT contain which type of proteins
tensile proteins
which function do all 3 muscles perform
moving and storing material throughout the body
the outermost layer of connective tissue surrounding a skeletal mm is the
epimysium
what characteristics describe both skeletal and cardiac muscle
striations
after the fusion of myoblasts, the muscle fiber loses its ability to
go through mitosis
sequence of structures that action potentials move through to excite skeletal mm contraction
AST
axon of neurons
sarcolemma
T-tubules
which protein is used to reinforce the sarcolemma and help transmit the tension generated by the sarcomeres to the tendons
tropomyosin
for crossbridges to occur, what events must happen
ACM
ATPase breaks down ATP
calcium ions be present in sarcoplasm
myosin binding sites be exposed
at the neuromuscular junction _____ must enter the synaptic end bulb to stimulate the release of _____ which binds to ligand gates so ____ can enter the muscle fiber
calcium ions, ACh, sodium ions
which ATP production would be sufficient to run in place for one minute
anaerobic cellular respiration
why would cardiac muscles have longer refractory periods then skeletal mms
to preserve the normal rhythm of the heart and prevent fatigue
world class shot-putters will have a higher % of ___ in their arm muscles
fast glycolytic fibers
which microscopic structure is found only in the cardiac mm tissue
intercalated discs
smooth mm tone is maintained by the prolonged presence of ____ in the mm cells cytosol
acetylcholine
what disorder occurs when little to no proteins are produced to support the sarcolemma
muscular dystrophy
when an athlete performs a pull up the process of pulling the body up so the chin can touch the bar is
concentric
strength training would result in
hypertrophy of fast oxidative- glycolytic fibers
mitochondrial activity in skeletal mm cells are usually efficient but can have limited ATP production if
there is limited O2 availability
after prolonged strenuous exercise has stopped, heavy breathing will often continue for several minutes in order to provide the O2 needed to
replace O2 displaced from mm myoglobin
convert the lactic acid produced during exercise back into glycogen
resynthesize creatine phosphate
cross bridges are formed during mm contraction when ____ binds to ____
myosin binds to actin
what happens if you treat the patient w a drug that inhibits the activity of acetylcholinesterase
the drug will increase contraction
