quiz Flashcards
the nervous system is composed
neural tissue. Including neurons and neuroglial cells, blood vessels
and connective tissue.
what are two systems that the nervous system are divided into
central and peripheral
what do sensory functions do
employ receptors that detect internal and external changes in the body
what do motor function do
use effectors that respond when they are stimulated by motor impulses
a. Motor portion of the PNS involved in voluntary activities is the somatic NS
b. Motor portion of the PNS involved in involuntary activities is the autonomic NS
what does a neuron include
cell body, body processes, and the organelles usually found in cells
what do dendrites and the cell body provide
Dendrites and the cell body provide receptors sites.
describe a neuron
a single axon from the cell body & maybe enclosed in a myelin sheath & a neurolemma.
what matter do nueron contain
white and gray matter
what do white matter contain
myelinated axons
what do gray matter contain
unmyelinated structures and cell bodies, dendrites
Schwann Cells
• produce myelin found on
peripheral myelinated neurons
• speed neurotransmission
Satellite Cells
• support clusters of neuron cell bodies (ganglia)
Astrocytes
• CNS • scar tissue • mop up excess ions, etc • induce synapse formation • connect neurons to blood vessels
Oligodendrocytes
- CNS
* myelinating cell
Microglia
- CNS
* phagocytic cell
Ependymal
- CNS
- ciliated
- help flow of CSF
- line ventricles of brain (BBB)
what does integrative function do
bring sensory information together and result in decisions that are acted upon by
means of motor functions.
Dendrites
process that conducts impulses towards the cell body
Neuron
nerve cell
axon
conducts impulses away from the cell body
cell body
Largest part of a typical neuron; contains the nucleus and much of the cytoplasm
Nodes of Ranvier
gaps in the fatty substances around axons
myelin sheath
fatty substance that insulates axons
Synapse
A junction where information is transmitted from one neuron to the next.
a. Ions are distributed so that the inside of a cell is __________________ and the outside is __________
negative and postive
b. At resting potential there are more ________ ions inside and more________ ions outside.
sodium and potassium
c. This distribution is maintained by the _______________ pump.
na/k
