Exam 13: A: Nervous System Cells

Unipolar neurons have no axons.

Small,distinct regions of gray matter within the CNS are called nuclei.

The nervous system is designed to detect stimuli from both the internal and external environment.

When a neuron is resting,its membrane potential is zero.

Enkephalins and endorphins are subclasses of amines that are pain relievers.

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

Local potentials can also be called graded potentials.

Most of the neurons in the brain and spinal cord are unipolar.

Gray fibers probably do not have nodes of Ranvier.

Bipolar and multipolar are examples of the structural classification of neurons.

When epinephrine and norepinephrine are released into the bloodstream,they are called hormones instead of neurotransmitters.

There are about 900 million glia cells in the nervous system.

Astrocytes attempt to assist the neurons of the central nervous system in healing and regrowth.

Groups of cell bodies located in the brain or spinal cord are referred to as ganglia.

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

Ependymal cells engulf and destroy microbes and cellular debris in inflamed or degenerating brain tissue.

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

Microglia are functionally and developmentally very close to neurons.

In neurons,microtubules are called neurofibrils.

Cell body and perikaryon are interchangeable terms.