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Action Potential
Action Potential from nerve leading to muscle contraction
17
Physiology
Undergraduate 2
11/13/2010

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Cards

Term
Start
Definition
Stimulus-gated ion channels open in a neuron
Term
Step 2
After Stimulus-gated ion channels open in a neuron
Definition
Voltage-gated sodium channels open in a neuron
Term
Step 3
After Voltage-gated sodium channels open in a neuron
Definition
Voltage-gated calcium channels open in a neuron
Term
Step 4
After Voltage-gated calcium channels open in a neuron
Definition
Neurotransmitters are released from the neuron via exocytosis
Term
Step 5
After Neurotransmitters are released from the neuron via exocytosis
Definition
Acetylcholine binds to the postsynaptic membrane of the motor endplate
Term
Step 6
After Ach binds to the postsynaptic membrane of the motor endplate
Definition
Ligand-gated sodium channels open in the motor endplate
Term
Step 7
After Ligand-gated sodium channels open in the motor endplate
Definition
Depolarization spreads down the t-tubule
Term
Step 8
After depolarization down t-tuble
Definition
Calcium channels open in the terminal cisternae
Term
Step 9

After Ca2+ chanels open in terminal cisternae
Definition
Calcium is released from the terminal cisternae
Term
Step 10

After terminal cisiernae realses ca2+
Definition
Calcium binds to Troponin
Term
Step 11

After Ca2+ binds to troponin
Definition
Troponin changes shape
Term
Step 12

After toponin changes shape
Definition
Tropomyosin moves, exposing the active sites on actin
Term
Step 13

After active sites on actin exposed
Definition
Myosin binds to the active sites of actin
Term
Step 14

After myosin binds to the active sites of actin
Definition
Power stroke occurs
Term
Step 15
After power stroke
Before cross bridge
Definition
ATP binds to myosin heads
Term
Step 16
2nd to end
Definition
Cross-bridges detach
Term
End
Definition
Calcium is actively transported back into the sarcoplasmic reticulum
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