Terms in this set (138)
1st step at neuromuscular AP (action potential) travels down the axon to the axon terminal
junction
1st step of contraction cycle myosin head hydrolyzes ATP & become energized & oriented
Once the nerve impulses stops the leftover Ach is broken down
1st step of muscle relaxation by ACHase (steps)
- muscle fiber membrane is no longer stimulated
polarization
1st step of nerve conduction
- sodium outside, potassium inside
1st step of sliding filament myosin pulls on actin, causing thin filament to slide inward
theory * ratchet along filaments
2nd step at neuromuscular electrical gated Ca2+ channels open & Ca2+ enters axon
junction terminal
2nd step of contraction cycle myosin head binds to actin, forming a cross-bridge
resting potential
2nd step of nerve conduction - nothing happens
- waiting for impulse
2nd step of relaxation potassium ions leave the muscle cell causing repolarization
2nd step of sliding filament z discs move towards each other, & sarcomere shortens
theory
3rd step at neuromuscular Ca2+ causes vesicles to release ACh into synaptic cleft
junction
myosin head pivots, pulling the thin filament past the thick
3rd step of contraction cycle
filament toward center of sarcomere (power stroke)
, action potential
3rd step of nerve conduction - sodium ion begins to move
- impulse copies into axon
calcium ions are actively transported back into sarcoplasmic
3rd step of relaxation
reticulum
thanks to structural proteins, there is a transmission of force
3rd step of sliding filament
throughout the entire muscle
theory
* resulting in whole muscle contraction
4th step of contraction cycle as myosin head binds ATP, cross-bridge detaches from actin
repolarization
4th step of nerve conduction - potassium moves out
- impulse done thru axon & myelin sheath
4th step of neuromuscular ACh diffuses across synaptic cleft & bind to its receptors on the
junction muscle
4th step of relaxation linkage b/w actin & myosin filaments break
4th step of sliding filament changes in I band & H zone as muscle contracts
theory
5th step at neuromuscular ACh binding opens ion channels & sodium rushes into muscle
junction
hyperpolarization
- potassium & sodium have switch places
5th step of nerve conduction
- nothing is moving
- impulse is moving to next neuron
5th step of relaxation actin & myosin filaments slide apart
6th step at neuromuscular if muscle reaches threshold (-55mv)at motor end plate, an AP
junction occurs on muscle
refractory period
6th step of nerve conduction
- everything is moving back to RMP
6th step of relaxation muscle fiber (sarcomere) relaxes
1st step at neuromuscular AP (action potential) travels down the axon to the axon terminal
junction
1st step of contraction cycle myosin head hydrolyzes ATP & become energized & oriented
Once the nerve impulses stops the leftover Ach is broken down
1st step of muscle relaxation by ACHase (steps)
- muscle fiber membrane is no longer stimulated
polarization
1st step of nerve conduction
- sodium outside, potassium inside
1st step of sliding filament myosin pulls on actin, causing thin filament to slide inward
theory * ratchet along filaments
2nd step at neuromuscular electrical gated Ca2+ channels open & Ca2+ enters axon
junction terminal
2nd step of contraction cycle myosin head binds to actin, forming a cross-bridge
resting potential
2nd step of nerve conduction - nothing happens
- waiting for impulse
2nd step of relaxation potassium ions leave the muscle cell causing repolarization
2nd step of sliding filament z discs move towards each other, & sarcomere shortens
theory
3rd step at neuromuscular Ca2+ causes vesicles to release ACh into synaptic cleft
junction
myosin head pivots, pulling the thin filament past the thick
3rd step of contraction cycle
filament toward center of sarcomere (power stroke)
, action potential
3rd step of nerve conduction - sodium ion begins to move
- impulse copies into axon
calcium ions are actively transported back into sarcoplasmic
3rd step of relaxation
reticulum
thanks to structural proteins, there is a transmission of force
3rd step of sliding filament
throughout the entire muscle
theory
* resulting in whole muscle contraction
4th step of contraction cycle as myosin head binds ATP, cross-bridge detaches from actin
repolarization
4th step of nerve conduction - potassium moves out
- impulse done thru axon & myelin sheath
4th step of neuromuscular ACh diffuses across synaptic cleft & bind to its receptors on the
junction muscle
4th step of relaxation linkage b/w actin & myosin filaments break
4th step of sliding filament changes in I band & H zone as muscle contracts
theory
5th step at neuromuscular ACh binding opens ion channels & sodium rushes into muscle
junction
hyperpolarization
- potassium & sodium have switch places
5th step of nerve conduction
- nothing is moving
- impulse is moving to next neuron
5th step of relaxation actin & myosin filaments slide apart
6th step at neuromuscular if muscle reaches threshold (-55mv)at motor end plate, an AP
junction occurs on muscle
refractory period
6th step of nerve conduction
- everything is moving back to RMP
6th step of relaxation muscle fiber (sarcomere) relaxes
