1. Myelination of our axons allows fast transduction. Discuss how an action pote

Question

1. Myelination of our axons allows fast transduction. Discuss how an action potential travels from the axon hillock to the axon terminal (4-6 sentences; discuss myelination, nodes of Ranvier, Na+/K+ ion movement and direction).

2. Sodium (Na+) is highly concentrated on the _____________ (inside/outside) of the membrane. Its gradient causes it to rush _____________ (inside/outside) the cell when the neuron is stimulated.

3. Potassium (K+) is highly concentrated on the _____________ (inside/outside) of the axon. Once the electrical potential reaches +40 mV, K+ channels fully open and K+ ions rush _____________ (inside/outside) the neuron

Explanation / Answer

Answer:

1. To communicate information to other neurons, action potentials must travel axon hillock to the axon terminal. Myelination of axons helps current leakage that improves the speed of action potential. Nodes of Ranvier help to save energy and maintain its speed by regenerating action potentials again and again.  Na+ and K+ channels continuously regenerate action potentials in nodes of Ranvier to maintain the speed of current. synaptic transmission insures that information is forwarded to the next neuron. The flow of information is unidirectional.

2. Outside, Inside

3. Inside, Outside

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