BIO 253 QUIZ 3 QUESTIONS AND
ANSWERS 2025
nervous system - ANSWERThe master controlling and communicating system of the
body
neurons conduct ___ to other neurons - ANSWERimpulses/signals
neurotransmitter - ANSWERsources of signals
neuroglia - ANSWERcells that provide protection, support, insulation and nut to neurons
CNS - ANSWERbrain and spinal cord
PNS - ANSWERspinal and cranial nerves
SAME - ANSWERsensory=afferent
motor=efferent
sensory - ANSWEReyes and ears
sensory (afferent) neurons send - ANSWERmessages to the brain
subdivisions of PNS - ANSWERmotor and sensory
motor division divided into 2 - ANSWERsomatic=skeletal
autonomic= smooth/cardiac muscle + glands
neurons have - ANSWERcell body
dendrites
axon
dendrites - ANSWERreceive signal
axons - ANSWERcovered in mylelon sheath
neurons have many dendrites but 1 - ANSWERaxon
action pot (nerve impulse) starts at - ANSWERaxon hillock
Nodes of Ranvier - ANSWERgaps in the myelin sheath
unmyelinated axons - ANSWERencased by Schwann cell cytoplasm
, multipolar neuron - ANSWERa nerve cell that has many dendrites and a single axon
bipolar nueron - ANSWERonly one axon and one dendrite
unipolar neuron - ANSWERa neuron with one process extending from its cell body
sensory neurons carry info to - ANSWERCNS
in PNS cell bodies are in - ANSWERganglia
interneurons located in CNS are - ANSWERmessenger man
motor neurons carry impulses to - ANSWEReffectors
out of brain/spinal cord
4 Types of Neuroglia - ANSWERastrocytes
oligodendrocytes
microglia
ependyma
Astrocytes - ANSWERfound between neuron and blood vessels
aid metabolism
scar tissue
Oligodendrocytes in CNS - ANSWERmyelinate axons
structural support
microglia in CNS - ANSWERclean up area- phagocyte
structural support
ependyma in CNS - ANSWERcilia
CSF
ventricles
chroid plexus - ANSWERproduce CSF
Schwann cells - ANSWERproduce myelin in PNS
speed up nerve impulse
Satellite cells (PNS) - ANSWERhelp support
provide nut
neurons die in - ANSWERCNS
normal cell at rest - ANSWERsalty banana
ANSWERS 2025
nervous system - ANSWERThe master controlling and communicating system of the
body
neurons conduct ___ to other neurons - ANSWERimpulses/signals
neurotransmitter - ANSWERsources of signals
neuroglia - ANSWERcells that provide protection, support, insulation and nut to neurons
CNS - ANSWERbrain and spinal cord
PNS - ANSWERspinal and cranial nerves
SAME - ANSWERsensory=afferent
motor=efferent
sensory - ANSWEReyes and ears
sensory (afferent) neurons send - ANSWERmessages to the brain
subdivisions of PNS - ANSWERmotor and sensory
motor division divided into 2 - ANSWERsomatic=skeletal
autonomic= smooth/cardiac muscle + glands
neurons have - ANSWERcell body
dendrites
axon
dendrites - ANSWERreceive signal
axons - ANSWERcovered in mylelon sheath
neurons have many dendrites but 1 - ANSWERaxon
action pot (nerve impulse) starts at - ANSWERaxon hillock
Nodes of Ranvier - ANSWERgaps in the myelin sheath
unmyelinated axons - ANSWERencased by Schwann cell cytoplasm
, multipolar neuron - ANSWERa nerve cell that has many dendrites and a single axon
bipolar nueron - ANSWERonly one axon and one dendrite
unipolar neuron - ANSWERa neuron with one process extending from its cell body
sensory neurons carry info to - ANSWERCNS
in PNS cell bodies are in - ANSWERganglia
interneurons located in CNS are - ANSWERmessenger man
motor neurons carry impulses to - ANSWEReffectors
out of brain/spinal cord
4 Types of Neuroglia - ANSWERastrocytes
oligodendrocytes
microglia
ependyma
Astrocytes - ANSWERfound between neuron and blood vessels
aid metabolism
scar tissue
Oligodendrocytes in CNS - ANSWERmyelinate axons
structural support
microglia in CNS - ANSWERclean up area- phagocyte
structural support
ependyma in CNS - ANSWERcilia
CSF
ventricles
chroid plexus - ANSWERproduce CSF
Schwann cells - ANSWERproduce myelin in PNS
speed up nerve impulse
Satellite cells (PNS) - ANSWERhelp support
provide nut
neurons die in - ANSWERCNS
normal cell at rest - ANSWERsalty banana
