Exam 19: Nerve Signaling

Match each term with its definition or description. -Type of cell that could be a neuron or a muscle cell

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:

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.

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

Many anesthetics produce their effects by inhibiting the opening of the potassium channels, blocking the repolarization of nerve impulses.

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

If a membrane exhibits a membrane potential, it is said to be polarized.

Which is true of an action potential?

In a synapse, both the presynaptic cell and postsynaptic cell must be neurons.

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

Match each term with its definition or description. -Chemical that carries a nerve impulse across a synaptic cleft

In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier.

Action potential and membrane potential are synonymous terms.

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.

Local potentials can also be called graded potentials.

During the nerve impulse, the internal charge of the neuron becomes briefly positive.

Neurotransmitters are released in a synapse and bind to:

Myelinated axons without gaps in the myelin (nodes of Ranvier) conduct impulses more efficiently than axons with nodes of Ranvier.