Exam 19: Nerve Signaling

The neurotransmitter acetylcholine always has an excitatory effect.

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

The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second.

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

Spatial summation is the effect produced by a rapid succession of stimuli on a single postsynaptic neuron.

Acetylcholine is in the same class of neurotransmitters as:

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

Define IPSP and EPSP.

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

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

A synapse can occur only between an axon and:

For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open?

Synapses between axons are the most common synapses in the nervous system.

An electrical synapse occurs when a strong action potential is able to arc across a small synaptic cleft.

Three structures make up a synapse: a synaptic knob, a synaptic cleft, and the plasma membrane of the postsynaptic neuron.

A neurotransmitter can be excitatory or inhibitory, not both.

No impulse can be sent if a nerve cell is in the absolute refractory period.

Match each term with its definition or description. -Type of synapse that occurs when two cells are joined by a gap junction

Which is true of an action potential?

The lack of dopamine is linked to the symptoms of Parkinson's disease.