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Muscle contraction steps

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order and explanation of muscle contractions

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Muscle contraction stepsOnline version

order and explanation of muscle contractions

by Rachel Beal
1

ATP Acetylcholine myosin glycogen junctio sacromeres neuromuscular energy actin

is released from a neuron ending into the synaptic cleft at the

2

cross Acetylcholine ATP potassium calcium bridges cytoplasm receptors

binds to and stimulates the action potentia l

3

sarcoplasmic tubules contraction stimulation channels troponin energy potassium reticulu T calcium actin

The action potential travels down the sarcolemma and - and activates the in the

4

muscl actin myosin calcium cell ATP muscle potassium

The sarcoplasmic reticulum releases into the

5

ATP acetylcholine calcium Calcium glycogen potassium troponin tropomyosin myosin actin

binds to which shifts so that binding sites on are expose d

6

potassium cross ATP Myosin bridge action-potential troponin calcium

heads bind to actin , forming -

7

cytoplasm potassium sarcoplasmic reticulum calcium neuromuscular junction actin muscle cell sarcomeres

Using the chemical energy contained in ATP , myosin heads pull filaments together within the , and shorten s

8

myosin ends actin calcium cytoplasm ATP muscle sarcoplasmic reticulum heads potassium

New is used to detach and move them back into position for another power strok e

9

calcium begins moves atp ends actin action potential potassium reticulu sarcoplasmic muscle energy

The relaxes when stimulation , and the is pumped back into the

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