Exam 19: Nerve Signaling

The first event to occur when an adequate stimulus is applied to a neuron is:

Explain a way that the nerve cell is able to respond to stimuli of different strengths.

Glutamate is the most common excitatory neurotransmitter in the CNS.

The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are):

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

Action potentials travel in only one direction along a nerve fiber.

No impulse can be sent through a neuron:

The relative refractory period can determine the strength of a stimulus even if the axon functions on the "all-or-none" law.

Within the plasma membrane, ion channels called leak channels are always open.

All neurotransmitters are organic molecules.

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

A synapse consists of:

Explain the ways in which the activity of the neurotransmitter is stopped at the postsynaptic receptor.

When a neuron is resting, its membrane potential is zero.

The speed of a nerve impulse depends on the neuron's resting potential.

The cell will send an impulse during the relative refractory period as long as the stimulus is below threshold.

When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called:

Explain the two types of refractory periods. Explain how the relative refractory period can help determine the strength of the stimulus.

Serotonin and histamine are both in the monoamine subclass of neurotransmitters.

Match each term with its definition or description. -Tiny bulge at the end of the presynaptic cell