Exam 19: Nerve Signaling

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

If the threshold potential is surpassed, the full peak of the action potential is always reached.

The difference between sodium and potassium in the generation of action potential is that:

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

There is a time when a neuron will not send a nerve impulse no matter how strong the stimulus is.

Which of the following statements about amino acid neurotransmitters is incorrect?

Some neurotransmitters use cyclic adenosine monophosphate as a second messenger to cause a response in the postsynaptic cell.

Name and briefly describe the different types of neurotransmitters used by the nervous system.

An inhibitory postsynaptic potential is produced through the hyperpolarization of the postsynaptic membrane.

Which of the following is not used by the body as a neurotransmitter?

Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)?

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

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

The difference in electrical charge between the inside and outside of a membrane is called the membrane potential.

Some neurotransmitters can be transported back to the synaptic knob and be reused by the neuron.

Which neuron could transmit a nerve impulse the fastest?

The action potential is called an all-or-none response, because if the threshold potential is surpassed, the full peak of the action is always reached; if the threshold potential is not surpassed, no action potential will occur.

How long a memory lasts is related to what occurs at a synapse.

The sodium-potassium pump actively pumps three potassium ions out of the neuron and two sodium ions into the neuron.