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Week 7 Chapter 18

Identify which diagram represents a microglial cell. C
Chemical signals diffuse between neurons at this location. synapse
Identify the letter that indicates a Schwann cell. C
Bundles of myelinated fibers make up the white matter of the nervous system.
Identify which diagram represents a cell that produces a myelin sheath in the central nervous system. E
These regions of the neuron direct electrical currents toward the cell body. dendrite
The somatic nervous system carries information to the skeletal muscles.
This tends to be the longest cytoplasmic projection from a neuron. axon
Identify the letter that indicates the region of a neuron where neurotransmitters are released. E
Axodendritic synapses occur between letter "E" on the diagram and this region on a proximal neuron. A
The efferent pathways of the autonomic nervous system can be divided into the __________ divisions. parasympathetic and sympathetic
The _____ of a neuron is a single process that usually extends from a tapered portion of the cell body. axon
A signal conduction route to and from the central nervous system is a(n) reflex arc.
Excitable cells that conduct the impulses are called neurons
Which of these glia cells are located in the peripheral nervous system? Schwann cells
Identify the letter that indicates the gaps between Schwann cells that are known as myelin sheath gaps (nodes of Ranvier). D
The glia cells that help form the blood-brain barrier are the astrocytes
The structural and functional center of the entire nervous system is the _____ nervous system. central
Nerves that originate from the brain are called _____ nerves. cranial
Identify which letter represents an oligodendrocyte. E
The ________ of a presynaptic neuron associates with the dendrite of a postsynaptic neuron. axon terminal
What structure of the Schwann cell is essential to normal nerve growth and the regeneration of injured nerve fibers? neurilemma
Identify which diagram represents cells that produce and circulate cerebrospinal fluid. D
Which of the following is not a structural classification of neurons? polar
Identify the letter that indicates the region of a neuron with a name that means "little hill." B
The _____ nervous system is a complex network of nerve pathways embedded in the intestinal wall with a network of integrators and feedback loops that can act somewhat independently. enteric
What term describes the bundles of nerve fibers within the central nervous system? tracts
This is the site of communication between neurons. synapse
Identify which letter represents the most abundant category of glial cells in the CNS. B
Neurons have very limited capacity to repair themselves.
Which of the following compounds cannot cross the blood-brain barrier? Dopamine
Neurons in the CNS have less chance of regenerating for all of the following reasons except: microglia lay down scar tissue.
Regeneration of nerve fibers will take place only if the cell body is intact and the fibers have: a neurilemma.
The part of the nervous system that transmits impulses from the CNS to the skeletal muscle is the: somatic nervous system.
Which is true of a reflex arc? It always consists of an afferent neuron and an efferent neuron.
Interneurons reside in the: CNS only.
The autonomic nervous system does not stimulate: skeletal muscles.
Nerves that contain mostly afferent fibers are called _____ nerves. sensory
A neuron that transmits a nerve impulse toward the central nervous system is called a(n): sensory neuron.
Which of the following is the deepest connective tissue layer of a nerve? Endoneurium
Which of the following is not a function of the central nervous system (CNS)? Integrating sensory information Evaluating the information Initiating an outgoing response
Dendrites conduct impulses _____ cell bodies. toward
Schwann cells have a function in the PNS that is similar to that of which cells in the CNS? Oligodendrocytes
The efferent pathways of the autonomic nervous system consist of the ________ nervous systems. sympathetic and parasympathetic
The afferent pathways of the autonomic nervous system: carry feedback information to integrating centers in the brain.
The nervous system can be divided: in all of the above ways.
The largest and most numerous types of neuroglia are the: astrocytes.
Small distinct regions of gray matter in the CNS are called: nuclei
The nervous system is organized to do which of the following? Detect changes in the external environment. Detect changes in the internal environment. Evaluate changes in the environment.
Along a neuron, the correct pathway for impulse conduction is: dendrite, cell body, and axon.
One of the components of the blood-brain barrier is: astrocytes.
In the human nervous system: there are almost equal numbers of glia cells and neurons. For a long time, scientists thought that glia far outnumbered neu-rons, but research has shown that there are equally large numbers of both neurons and glia in the human nervous system. One stu
Most unipolar neurons are usually: sensory neurons.
Astrocytes attach to: neurons. and blood vessels.
Multipolar neurons have: multiple dendrites and one axon.
Fascicles are held together by a connective tissue layer called the: perineurium.
The white matter of the nervous system is made up of: myelinated fibers.
Gray matter in the brain and spinal cord consists primarily of: cell bodies.
Which is not true of the myelin sheath? It covers cell bodies in the brain and spinal cord.
A neuron that has only one axon but several dendrites is classified as a _____ neuron. multipolar
Created by: ashleysummers
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