Terms in this set (12)
In order to move a muscle fiber, an impulse must be sent down a motor nerve ________.
At the end of this nerve is a swelling called the __________ and where the nerve and muscle fiber come together is a region called the ___________________ _______________
bouton; neuromuscular junction
As the action potential reaches the axon terminal, ______________ flows into the bouton causing bubbles called _____________ to fuse to the distal membrane.
Inside these bubbles is a neurotransmitter called ____________.
When these bubbles burst, the neurotransmitter is released into the gap between the nerve and muscle fiber. This gap is called the _______________ ______________
As this chemical floods the gap, it reaches the muscle membrane called the _______________ which has binding sites for the neurotransmitter.
When the neurotransmitter is bound, the ____________ ________ ____________ depolarizes and the action potential continues throughout the muscle fiber. This impulse causes calcium to be released from the _______________ _____________ which is part of the ____________ ____________
motor end plate; terminal cisternae; sarcoplasmic reticulum
These ions flow into the sarcomere where they bind to a protein molecule called _______________ which is found on the thin filament called ___________.
When they join, binding sites on the thin filamen become available because another protein called ______________ (that was covering these sites) has been moved.
If the thick filament called _____________ has been charged by __________, extensions of the thick filament called_____________ __________ will bind to the thin filament's open binding sites.
myosin; ATP; cross bridges
The energy provided allows the thick filament to pull the z-lines closer together and shorten the ______________.
To relax the muscle fiber, an enzyme called ______________ denature the neurotransmitter and the calcium ions are pumped back.
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