easy · Enhanced ACT science
In an experiment on nerve conduction, the speed of an impulse is measured in two types of neurons:
| Neuron Type | Myelin Sheath | Speed (m/s) |
| :--- | :--- | :--- |
| Type A | Present | 100 |
| Type B | Absent | 2 |
What is the functional role of the myelin sheath based on this data?
- It acts as an electrical insulator that increases the speed of impulse transmission.
- It provides the chemical energy (ATP) required for the sodium-potassium pump.
- It ensures that the nerve impulse can travel in both directions along the axon.
- It serves as the primary receptor for neurotransmitters released into the synapse.
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