1. Why are action potentials usually conducted in one direction? A) The slowing

Question

1. Why are action potentials usually conducted in one direction?

A) The slowing of the sodium potassium pump

B) Brief refractory periods that prevent reopening of voltage gated Na+ channels.

C) Ions can flow along the axon in only one direction

D) A&B

E) B&C

2) Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium channel and opens it. This is an example of____.

A) A voltage-gated sodium channel

B) A voltage-gated acetycholine channel

C) A chemical signaling mechanism

D) A second messenger signal

E) A neurotransmitter inhibiting an action potential

Explanation / Answer

1) The correct option is B. Brief refractory periods that prevent reopening of voltage gated Na+ channels.

Action potentials are usually conducted in one direction, because refractory period prevents reopening of voltage-gated Na+ channels.

2) The correct option is B. A voltage-gated acetycholine channel.

This is an example of voltage-gated acetycholine channel. The nicotinic acetylcholine receptor, a ligand-gated cation channel accepts both K+ and Na+. This receptor functions in synapses between motor neurons and skeletal muscle cells.

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