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Eastham Muscle

Contractility ability of skeletal muscle to shorten with force
excitability capacity of skeletal muscle to respond to a stimulus
extensibility ability to be stretched
elasticity ability to recoil
epimysium connective tissue sheath
fascia connective tissue located outside the epimysium
fibers muscle cells
fasciculi numerous visible bundles
endomysium single cylindrical cell containing several nuclei
myofibrils threadlike structure that extends from one fiber to the other
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres highly ordered units
the basic structural and functional unit sarcomeres
z line Z line is an attachment site for actin
where do sarcomeres extend from from one Z line to another Z line
what do actin and myosin look like? actin and myosin give a banded appearance
what is a z line called I band
what does the z line consist of actin
what does the A band do extends the length of myosin
what is the a band? darker central region of each sarcomere.
light area in a sarcomere h line
what is in the h line myosin
myosin myofilaments center of the sarcomere
dark staining band M line
charge difference across the membrane? resting membrane potential
action potential muscle cell stimulated by the membrane characteristic changes
Motor neurons- nerve cells that carry action potentials to skeletal muscle fibers
where do axons enter? through muscles and branches
when a branch connects to a muscle what is it called? neuromusclular junction
what is another name for neuromuscular junction? synapses
where are the neuromuscular junctions located? near center of cell
single motor neuron motor unit
motor units form how many muscles? one
enlarged nerve terminal presynaptic terminal
what is the space between the presynaptic terminal and the muscle cell? synaptic cleft
what is the postsynaptic terminal? muscle fiber
what does the presynaptic terminal consist of? synaptic vesicles
secrete neurotransmitter acetylcholine
what is acetylcholine? diffuses across the synaptic cleft and binds to the postsynaptic terminal
what can acetylcholine cause? a change in the postsynaptic cell
what happens when acetylcholinesterase is released synaptic cleft between the neuron and muscle cell and it gets rapidly broken down by enzymes
what happens during a enzymatic breakdown? ensures that one action potential slows down only one action potential in the skeletal muscle
how many contractions occurs during enzymatic breakdown? one contraction
Where are the contractions during enzymatic breakdown? in the muscle cell
when does muscle contraction occur? when the actin and myosin are sliding past each other
when do muscles shorten? When the sarcomeres shorten
what is sliding filament mechanism the sliding of actin myofilaments past myosin myofilaments during contraction
what bands shorten during contraction? H and I bands shorten
what band does not shorten during contraction a band
contraction of an entire muscle muscle twitch
what causes a muscle twitch? a stimulus that causes action potential in the muscle fibers
what is a threshold ? when a muscle fiber will not respond to until the stimulus reaches a specific level
when the muscle fibers contract maximally all or none response
time between a stimulus and a motor neuron lag phase
the lag phase can also happen during? beginning of a contraction
time of contraction contraction phase
time during muscle relaxation relaxation phase
when do frequent twitches occur? when too much successive stimuli is put out
what is tetany? the muscle remains contracted without a relaxation period
increase number of motor units being activated recruitment
what does atp mean? adenosine triphosphate
what does adp mean? adenosine diphosphate
what is atp used for? energy for muscle contraction
where is atp made? in the mitochondria
short lived and unstable atp
high-energy molecule creatine phosphate
without oxygen anaerobic respiration
aerobic respiration with oxygen
amount of oxygen being needed in chemical reactions oxygen debt
chemical reactions do what convert lactic acid to glucose
when ATP is is being used faster then it can be produced muscle fatigue
what is isometric equal distance
equal tension isotonic
what are slow muscle fibers they contract more slower
t or f- slow muscle twitches are more resistant to fatigue? true
muscle tone constant tension
what are fast muscle fibers contract quicker
are fast muscle twitches more resilient to fatigue yes
where is the origin? head
where is the belly located between the origin and insertion
what is insertion end of muscle going through the most movemet
Created by: Jayla4



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