1.) Envision the voltage-gated ion channels at a node of Ranvier. When these cha

Question

1.) Envision the voltage-gated ion channels at a node of Ranvier. When these channels open, they do so in a staggered manner. The sodium channels open first and then as they are closing, the potassium channels open. Does this mean that these two populations of ion channels respond to different triggering events?

yes or no

2.) Consider any synapse within a motor neuron’s dendritic field. This synapse is confined by two apposing membranes. Which one belongs to the motor neuron?

a.) post-synaptic membrane

b.) pre-synaptic membrane

3.) Neurosecretion is enabled by ion flux through ion channels associated with terminal knobs. Such ionchannels enable

Ca2+ flux

K+flux

4. Characterize the motor neuron in terms of the neurotransmitter it secretes.

a.) glutamatergic b.) cholinergic

Explanation / Answer

1. Yes.

Upon the recieval impulse, sodium ions start influx and make the membrae potential posotive, at this stag the potassium chnnels do not respond, but when the depolarization reaches its maximum, then potassium channels start efflux. Means they are responding to two different types of membrane potentials.

2. Presynaptic mmbrane.

3. Ca+2 flux

As the action potential reaches nerve terminal, the calcium ion influx causes exocytosis that triggers the release of stored neurotransmitter.

4. b. cholinergic

Glutamate is released by primary sensory neurons.

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