What are the two parts of the Nervous System?
CNS and PNS
CNS and Somatic
PNS and Somatic
Somatic and Sensory
What makes up the CNS?
brain
cranial nerves
spinal cord
spinal nerves that branch from the spinal cord
autonomous nervous system
What makes up the PNS?
glial cells outnumber neurons by about 50 to 1
what two types of cells make up the brain?
neurons
glial cells
red blood cells
white blood cells
what do neurons do?
are responsible for sending and receiving nerve impulses or signals
carry messages from organs to the brain
provide support and nutrition in the nervous system
maintain homeostasis
what do glial cells do?
send and receive nerve impulses or signals
they are non-neuronal cells that provide support and nutrition
form myelin
facilitate signal transmission in the nervous system
Label this diagram
what is true for dendrites?
receive incoming signals (from another neuron or receptor)
produce action potential
contain a nucleus
touches other neurons
where do the signals from one neuron communicate with other neurons?
synaptic terminals
axons
cell body
myelin sheath
neurons are replaceable and can divide
Are all cells myelinated?
yes
no
what is the purpose of myelin?
allows electric impulses to transmit efficiently and quickly along the nerve cells
slows the speed of nerve transition
is an insulating layer
prevents electric impulse transmission
glial cells do not propagate neural impulses but provide extremely important supportive and facilitative functions to the nervous system
select the 4 types of neuroglial cells in the CNS
astrocytes
oligodendro-cytes
microglia
ependyma
satellite
schwann
Which glial cell supports and regulates ions?
microglial cells
ependymal cells
oligodendrocytes
what do microglial cells do?
defend, engulf anything that should not be there
line cavities
myelinate and protect
support and regulate ions
Oligogendrocytes wrap and insulate by forming a myelin sheath within the CNS. Which glial cells have this function in the PNS?
satellite cells
schwann cells
satellite cells surround neuron cell bodies for support. Which glial cell does a similar function in the CNS?
microglial
ependymal
sensory neurons:
transmit impulses from sensory receptors toward the CNS
impulse moves from CNS to rest of the body
impulse moves between sensory and motor neurons within the CNS
motor neurons:
transmit impulses from the sensory receptors toward the CNS
impulse moves from the CNS to the rest of the body
Interneurons:
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