Nervous System Test
Cells that connect blood vessels to neurons are named
astrocytes
________ reflexes include the secretion of saliva, changes in the size of our pupils, and digestion involve the activities of smooth muscles.
autonomic
The Schwann cell forms a myelin sheath around the ________.
axon
The part of the neuron that typically conducts nerve impulses away from the cell body is the ________.
axon
The term central nervous system refers to the ________.
brain and spinal cord
The nervous system is structurally subdivided into two systems: ________ nervous system and ________ nervous system.
central; peripheral
The major role of the interneuron (association neuron) is to ________.
connect motor and sensory neurons in their pathways
The neuron processes that normally receive incoming stimuli are called ________.
dendrites
Cells that line the central cavity of the brain & spinal corded are named
ependymal cells
The two major functional properties of neurons are ________.
irritability and conductivity
Nerve cells that digest debris are called
microglial cells
The cell bodies of the ________ neurons are always located within the CNS
motor
Neurons with several processes branching off the cell body, such as motor neurons and interneurons (association neurons), are structurally classified as ________.
multipolar
Multiple sclerosis causes
myelin sheaths to be destroyed
Support cells in the central nervous system are collectively called ________.
neuroglia
The gaps between Schwann cells found at regular intervals in peripheral system neurons are called ________.
nodes of Ranvier
Nerve cells that make the myelin sheath are named
oligodendrocytes
Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid ________.
potassium
________ cells form the myelin sheaths around nerve fibers in the PNS
schwann
During repolarization, ________ ions are pumped out of the cell.
sodium
The skeletal muscles are controlled by the ____ nervous system.
somatic
The gap between two communicating neurons is termed ________.
synaptic cleft
Nerve fibers that transmit impulses from the the visceral organs are known as
visceral fibers
Myelinated fibers (tracts) form ________ matter while unmyelinated fibers form ________ matter.
white, gray
There are ________ pairs of cranial nerves and ________ pairs of spinal nerves in the peripheral nervous system.
12,31
Which type of reflex arc does not contain an interneuron and is the faster of the two
2 neuron arc
________ connect sensory and motor neurons in neural pathways and their cell bodies are typically located in the central nervous system
Interneurons (association neurons)