Exam 19: Nerve Signaling

Chemical synapses involve neurotransmitters.

A synapse consists of:

Severe depression can be caused by a deficit in certain brain synapses of:

Choose either IPSP or EPSP, and explain on a physiological basis how it will affect a postsynaptic neuron.

Explain the neuron doctrine and the reticular theory of the nervous system. Which is currently held to be the most correct?

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

Serotonin is an example of a(n):

In depolarization the membrane potential moves toward zero, whereas in hyperpolarization the membrane potential moves away from zero.

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

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

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. -Tiny bulge at the end of the presynaptic cell

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

A neurotransmitter can be either excitatory or inhibitory depending on the postsynaptic receptor.

Explain what characteristics of the neuron affect the speed at which action potentials are conducted. What is the range of speed at which an impulse can be conducted?

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

Action potential and nerve impulse are interchangeable terms.

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

Other than their color, describe the differences between white matter and gray matter. Which is able to conduct impulses more rapidly?

A neurologist is using a voltmeter to measure potential. The membrane potential of a neuron was recorded at +30 mV. This is what type of membrane potential?