All of the following might synapse with each other EXCEPT

Cell body with cell body.

The number of processes extending from their cell body can classify neurons structurally. Which is the most common neuron type in humans?

Multipolar.

Somatic sensory afferents transmit impulses from the _________to the CNS.

The skin.

The interior of a nerve cell has a slight excess of negative charge because

potassium diffuses out of the cell.

The Nissl bodies seen in the neuron cell body represents which cellular organelle?

Rough endoplasmic reticulum.

Tracts in the CNS correspond to ____________ in the PNS.

nerves.

Which of the following statements best describes the membrane situation in the resting state in the neuron?

All the voltage-gated Na+ and K+ channels are closed.

Which of the following line the central cavities of the brain and spinal cord and provides a barrier between the CSF and nervous tissue?

Ependymal cells.

Which of the following characteristics is NOT associated with a myelinated nerve fiber?

Slow conduction of nerve impulses.

Which of the following events is NOT involved in the transfer of information across a chemical synapse?

Direct flow of ions from one neuron to the next.

Which of the following electrical events occurs when a certain threshold is reached?

Action potential.

Which of the following factors is associated with increased conduction velocity in an axon?

Large diameter.

Which of the following is characteristic of the action of an IPSP but NOT in an EPSP?

Hyperpolarization is produced which spreads to the axon hillock.

A potential -90 mV would be considered to be

hyperpolarized.

During which phase of an action potential are voltage-gated K+ channels open, while voltage gated Na+ channels are closed?

Repolarizing phase.

Which of the following neurotransmitters acts as a natural opiate?

Endorphins

Which of the following statements concerning developmental aspects of neurons is INCORRECT?

The adult number of neurons is the same as those originally formed during the embryonic period.

Spatial summation occurs when

multiple local potentials occur at different places on the same cell at the same time.

Which of the following statements concerning inhibitory synapses (IPSP) is correct?

Postsynaptic membrane becomes more permeable to potassium and chloride.

Which of the following is NOT a biogenic amine neurotransmitter?

Acetylcholine.

Which of the following neuroglia is most responsible for the blood-brain barrier?

Astrocytes.

Which of the following types of neurons is found in the retina of the eye?

Bipolar.

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