Exam 19: Nerve Signaling

Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock.

In the mature nervous system, electrical synapses can occur only where there are gap junctions.

Carbon monoxide is the only neurotransmitter that is a gas rather than a liquid.

When epinephrine and norepinephrine are released into the bloodstream, they are called hormones instead of neurotransmitters.

Match each term with its definition or description. -Cell that releases the neurotransmitter

The influx of sodium ions causes the release of neurotransmitters from the synaptic knob.

Myelinated fibers conduct impulses faster than unmyelinated fibers.

The resting potential of a neuron is maintained by having mostly negative ions on the inside and mostly positive ions on the outside.

Within the nervous system, coding for the strength of a stimulus is accomplished through:

Stimulus-gated channels open in response to:

Cocaine produces a temporary feeling of well-being by blocking the release of dopamine.

Which of the following is not one of the main chemical classes of neurotransmitters?

Describe resting potential, including the position of potassium and sodium ions.

A synaptic knob would be located on a(n):

Which is true of a neuron with a resting potential?

The only ion(s) that can diffuse across a neuron's membrane when the neuron is at rest is (are):

Match each term with its definition or description. -Space between the presynaptic and postsynaptic cells

In a myelinated fiber, the action potential jumps from one node of Ranvier to the next.

When an impulse reaches a synapse:

Action potential and nerve impulse are interchangeable terms.