Exam 19: Nerve Signaling

Explain both temporal and spatial summation.

Local potentials usually occur in the dendrite or soma of the neuron.

No impulse can be sent if a nerve cell is in the absolute refractory period.

Action potentials usually occur in the axon of the cell.

Which of the following is true of spatial summation?

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

A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential.

Many anesthetics produce their effects by inhibiting the opening of sodium channels.

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

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

A resting neuron has a positive internal charge.

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

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

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

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?

Excitatory neurotransmitters are most likely to:

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

Which membrane receptor acts to directly change ion permeability when stimulated?

Match each term with its definition or description. -Type of synapse in which the signal from the presynaptic to postsynaptic cell is carried by a neurotransmitter

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