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Questions and Answers
Which protein forms the thick filament?
Which protein forms the thick filament?
- Tropomyosin
- Myosin (correct)
- Troponin
- Actin
What is the function of the myosin head?
What is the function of the myosin head?
- Binding to ATP and actin (correct)
- Binding to glucose and actin
- Synthesizing proteins
- Transporting calcium ions
What condition is required for myosin to bind to actin?
What condition is required for myosin to bind to actin?
- Presence of glucose
- High levels of ATP
- Absence of oxygen
- Exposure of binding sites by calcium ions (correct)
Which part of myosin binds to actin?
Which part of myosin binds to actin?
Which source of energy does the myosin head utilize for muscle movement?
Which source of energy does the myosin head utilize for muscle movement?
What is the term for the spot where the axon of a motor nerve nears the muscle fiber?
What is the term for the spot where the axon of a motor nerve nears the muscle fiber?
What is the name of the space between the axon and the muscle cell?
What is the name of the space between the axon and the muscle cell?
What neurotransmitter is contained within the terminal end of the axon?
What neurotransmitter is contained within the terminal end of the axon?
Where does the axon terminal of a motor nerve get close to but not touch the muscle?
Where does the axon terminal of a motor nerve get close to but not touch the muscle?
What are the small sacs within the terminal end of the axon filled with?
What are the small sacs within the terminal end of the axon filled with?
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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.
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