chapter 10 Flashcards
action potential comes from where
the brain
from the brain the action potential goes where
the spinal cord
from the spinal cord the action potential goes where
motor neuron
from the motor neuron goes where
the motor neuron of the PNS
from the PNS goes where
the axon terminal
when the action potential goes to the axon terminal what does it stimulate
the opening of voltage gated calcium ion channels
when voltage gated calcium channels are open what diffuses through to the axon terminal
calcium ions
what does calcium in the axon terminal stimulate
synaptic vesicles to fuse to the presynaptic membrane
by synaptic vesicle fusing to presynaptic membrane what happens
the release of ACH into the synaptic cleft
when ACH is released what happens
ACH binds to receptor of chemical gated sodium ion channels
when ach binds to receptor what happens
chemical gated sodium ion channels open
when chemical gated sodium ion channels open what is diffused across the sarcolemma
sodium ions
when sodium ions diffuse across the sarcolemma what happens
creation of new action potential in the muscle fiber
where does the new action potential go
travels down the sarcolemma into the T-tubules
from the T-tubules where does the action potential go
terminal cisternae
when action potential goes to the terminal cisternae what does this stimulate
the opening of voltage gated calcium ion channels
opening of voltage gated calcium ion channels allows what
calcium ions to diffuse out
when calcium ions diffuse out what happens to them
replenished by calcium ions stored in the SR
calcium ions that diffuse out of the terminal cisternae will go where
into the sarcomere
after calcium ions go to the sarcomere what happens
they bind to troponin
when calcium binds to troponin what happens
troponin changes configuration pulling on tropomyosin
when the pulling of tropomyosin happens what is exposed
the active binding site of G actin
what does the exposure of G-actin allow
the head of the myosin myo-filaments to bind to the active binding site
what happens after myofilaments bind to the binding site
ADP+P are released from myosin head
release of ADP+P does what
changes configuration of myosin head from upright to bent(powerstroke)
what does power-stroke do
pulls on actin myofilaments
the pulling of actin myofilaments cause what
actin and myosin to slide past one another
after actin and myosin slide past one another what happens
ATP binds to myosin head
the binding of ATP to myosin head causes what
myosin head to detach from active binding site of G actin
after myosin detaches what happens
ATP is broken down into ADP+P
the break down of ATP does what
reconfigures the myosin head from bent to upright
