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A & P Week 7

Chapter 17,18, & 19

Question	Answer
This is the site of communication between neurons.	synapse
The structural and functional center of the entire nervous system is the _____ nervous system.	central
Which of these glia cells are located in the peripheral nervous system?	Schwann cells
A signal conduction route to and from the central nervous system is a(n)	reflex arc.
This tends to be the longest cytoplasmic projection from a neuron.	axon
Bundles of myelinated fibers make up the	white matter of the nervous system.
The _____ of a neuron is a single process that usually extends from a tapered portion of the cell body.	axon
The glia cells that help form the blood-brain barrier are the	astrocytes.
What structure of the Schwann cell is essential to normal nerve growth and the regeneration of injured nerve fibers?	neurilemma
The ________ of a presynaptic neuron associates with the dendrite of a postsynaptic neuron.	axon terminal
These regions of the neuron direct electrical currents toward the cell body.	dendrite
What term describes the bundles of nerve fibers within the central nervous system?	tracts
Excitable cells that conduct the impulses are called	neurons.
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
The efferent pathways of the autonomic nervous system can be divided into the __________ divisions.	parasympathetic and sympathetic
The somatic nervous system carries information to the	skeletal muscles.
Chemical signals diffuse between neurons at this location.	synapse
What have very limited capacity to repair themselves?	Neurons
polar are not what?	a structural classification of neurons
These nerves originate from the brain and are called what type of nerves?	cranial
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.
The efferent pathways of the autonomic nervous system consist of the ________ nervous systems.	sympathetic and parasympathetic
Small distinct regions of gray matter in the CNS are called:	nuclei.
Which of the following is the deepest connective tissue layer of a nerve?	Endoneurium
The autonomic nervous system does not stimulate:	skeletal muscles.
Along a neuron, the correct pathway for impulse conduction is:	dendrite, cell body, and axon.
Multipolar neurons have:	multiple dendrites and one axon.
The afferent pathways of the autonomic nervous system:	carry feedback information to integrating centers in the brain.
Most unipolar neurons are usually:	sensory neurons.
A neuron that has only one axon but several dendrites is classified as a _____ neuron.	multipolar
Regeneration of nerve fibers will take place only if the cell body is intact and the fibers have:
Which is true of a reflex arc? A) It always consists of an afferent neuron and an efferent neuron B) It always consists of an afferent neuron and efferent neuron. C) It always consists of an afferent neuron, an efferent neuron, and an interneuron D) It always consists of an afferent neuron, and efferent neuron, the brain, and the spiral cord.	B) It always consists of an afferent and an efferent neuron
Interneurons reside in the:	CNS only.
Astrocytes attach to:	neurons & blood vessels.
Gray matter in the brain and spinal cord consists primarily of:	cell bodies.
Which is not true of the myelin sheath? A) It is associated with white fibers in the brain. B)It is important for nerve impulse conduction. C)It covers cell bodies in the brain and spinal cord. D)It is destroyed in those with multiple sclerosis.	C) It covers cell bodies in the brain and spinal cord.
The largest and most numerous types of neuroglia are the:	astrocytes.
A neuron that transmits a nerve impulse toward the central nervous system is called a(n):	sensory neuron
In the human nervous system:	here are almost equal numbers of glia cells and neurons.
Fascicles are held together by a connective tissue layer called the:	perineurium.
Which of the following compounds cannot cross the blood-brain barrier? A) Water B)Carbon dioxide C)Glucose D)Dopamine	D)Dopamine
Dendrites conduct impulses _____ cell bodies.	toward
The nervous system can be divided:	according to its structure, according to direction of information flow, by control of effectors.
Schwann cells have a function in the PNS that is similar to that of which cells in the CNS?	Oligodendrocytes
Nerves that contain mostly afferent fibers are called _____ nerves.	sensory
The white matter of the nervous system is made up of:	myelinated fibers.
The part of the nervous system that transmits impulses from the CNS to the skeletal muscle is the:	somatic nervous system.
Which of the following is not a function of the central nervous system (CNS)? A)Integrating sensory information B)Evaluating the information C)Initiating an outgoing response D)All of the above are functions of the CNS.	D)All of the given are functions of the CNS: Integrating sensory information, Evaluating the information, Initiating an outgoing response
One of the components of the blood-brain barrier is:	astrocytes.
Neurons in the CNS have less chance of regenerating for all of the following reasons except:	microglia lay down scar tissue.

Created by: Brookekotter0322

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