10 Questions
Which protein forms the thick filament?
Myosin
What is the function of the myosin head?
Binding to ATP and actin
What condition is required for myosin to bind to actin?
Exposure of binding sites by calcium ions
Which part of myosin binds to actin?
Globular head
Which source of energy does the myosin head utilize for muscle movement?
ATP
What is the term for the spot where the axon of a motor nerve nears the muscle fiber?
Neuromuscular junction
What is the name of the space between the axon and the muscle cell?
Synapse
What neurotransmitter is contained within the terminal end of the axon?
Acetylcholine
Where does the axon terminal of a motor nerve get close to but not touch the muscle?
Neuromuscular junction
What are the small sacs within the terminal end of the axon filled with?
Acetylcholine
Study Notes
Neuromuscular Junction
- The axon of a motor nerve approaches the muscle fiber, but doesn't touch it, leaving a small gap called the synapse.
- The axon terminal contains small sacs filled with the neurotransmitter acetylcholine.
Muscle Filaments
- Myosin forms the thick filament and has a long, fibrous tail and a globular head that binds to actin.
- Actin forms the thin filament and has binding sites that are exposed by calcium ions, allowing myosin to bind.
Myosin Function
- Myosin head binds to ATP, which is the source of energy for muscle movement.
- Calcium ions expose binding sites on actin, allowing myosin to bind and facilitate muscle movement.
Learn about the structure and function of the neuromuscular junction, including the axon terminal, synapse, and neurotransmitters.
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