Lab 5 Muscle Twitches Flashcards
functional unit of a contraction
sarcomere
thin filament
actin
thick filament
myosin
actin contains these two things
troponin and tropomyosin
muscle contraction blank muscle while blank slides over blank
shortens, actin, myosin
single quick contraction of muscle
simple twitch
three phases of contraction
latent, contraction, relaxation
four events of latent period
stimulus applied, ach released into synaptic cleft, ach binds to receptors on muscle, depolarization along sarcolemma, action potential, action potential goes down t tubules through the sarcoplasmic reticulum, calcium ions are released into sarcoplasm, calcium ions bind to troponin
latent period looks like blank on graph
flat line
contraction is the blank
formation of cross bridges between actin and myosin
longest phase
relaxation phase
why is relaxation phase longest
active transport requires atp so it is most complex
event during relaxation phase
calcium ions removed from troponin and pumped back into sarcoplasmic reticulum
spatial summation is aka
recruitment
muscle is made of many blank units
motor
motor unit goes by the blank law
all or none
each motor unit has a different blank
threshold
strength of a contraction is due to the blank of the blank
sum, motor units
an increase in strength of muscle contraction due to summation brought about by increasing strength of the stimulus by recruiting more motor units
spatial summation
temporal summation is aka
tetanus
individual fibers contract more blank if stimuli come blank together
strongly, closer
tetanus is due to increasing blank of stimulus
frequency
response of a skeletal or cardiac muscle to one single action potential
twitch
place where the nerve enters the body of that muscle
motor point
