Exam 19: Nerve Signaling

In the mature nervous system, electrical synapses can occur only where there are gap junctions.

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

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

Electrical synapses can be found in muscle tissue.

The magnitude of the action potential peaks when the sodium channels close.

A membrane that exhibits a membrane potential is said to be depolarized.

Explain both temporal and spatial summation.

Glutamate is the most common excitatory neurotransmitter in the CNS.

Action potential and membrane potential are synonymous terms.

The receptors embedded in the plasma membrane of a postsynaptic neuron are protein molecules.

Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes.

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

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

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

All neurotransmitters are organic molecules.

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

The opening of stimulus-gated channels is always followed by the opening of voltage-gated channels.

The neuron is able to maintain an internal negative charge by pumping out sodium (Na⁺) and pumping in chloride (Cl-).

Local potentials can also be called graded potentials.

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