bio 253 quiz 3 | Atcual Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
nervous system The master controlling and communicating
system
of the body
neurons conduct ___ to other impulses/signals
neurons
neurotransmitter sources of signals
neuroglia cells that provide protection, support,
insulation
and nut to neurons
CNS brain and spinal cord
PNS spinal and cranial nerves
SAME sensory=afferent
motor=efferent
sensory eyes and ears
, sensory (afferent) neurons send messages to the brain
subdivisions of PNS motor and sensory
motor division divided into 2 somatic=skeletal
autonomic= smooth/cardiac muscle +
glands
neurons have cell body
dendrites
axon
dendrites receive signal
axons covered in mylelon sheath
neurons have many dendrites but axon
1
action pot (nerve impulse) starts at axon hillock
Nodes of Ranvier gaps in the myelin sheath
unmyelinated axons encased by Schwann cell cytoplasm
multipolar neuron a nerve cell that has many dendrites and a
single
axon
Answers with Verified Solutions | Latest
Updated 2026
nervous system The master controlling and communicating
system
of the body
neurons conduct ___ to other impulses/signals
neurons
neurotransmitter sources of signals
neuroglia cells that provide protection, support,
insulation
and nut to neurons
CNS brain and spinal cord
PNS spinal and cranial nerves
SAME sensory=afferent
motor=efferent
sensory eyes and ears
, sensory (afferent) neurons send messages to the brain
subdivisions of PNS motor and sensory
motor division divided into 2 somatic=skeletal
autonomic= smooth/cardiac muscle +
glands
neurons have cell body
dendrites
axon
dendrites receive signal
axons covered in mylelon sheath
neurons have many dendrites but axon
1
action pot (nerve impulse) starts at axon hillock
Nodes of Ranvier gaps in the myelin sheath
unmyelinated axons encased by Schwann cell cytoplasm
multipolar neuron a nerve cell that has many dendrites and a
single
axon
