NU551 UNIT 3 | QUESTIONS AND ANSWERS | 2026
UPDATE | WITH COMPLETE SOLUTION.
Central Nervous System Answer - Consists of the brain and spinal cord,
enclosed within protective cranial vault and vertebrae
Different pathways in the peripheral nervous system? Answer - Afferent
(ascending) - carry sensory impulses toward CNS
Efferent (descending) - innervate skeletal muscle or effector organs by
transmitting motor impulses away from CNS
Somatic Nervous System Answer - Pathways that regulate voluntary motor
control
Autonomic Nervous System Answer - Regulation of the body's internal
environment (viscera) through involuntary control of organs
Further divided into sympathetic and parasympathetic
Two cells that constitute nervous tissue? Answer - Neurons
,Nonneuronal neuroglial cells
Neuron Answer - primary cell of the nervous system
electrically excitable cell and transmits and receives information
Neurological Cells Answer - provide structural support, protection, and
nutrition for neurons
facilitate neurotransmission
3 parts of a neuron Answer - cell body, dendrites, axon
Cell Body Answer - •Mostly located in the CNS
•Cell bodies in the PNS are found in groups called ganglia
Ganglia Answer - Clusters of cell bodies in the PNS
Dendrites Answer - Extensions that carry nerve impulses toward the cell body
Axons Answer - long conductive projections that carry nerve impulses away
from the cell body
Axon Hillock Answer - Cone shaped region of an axon where it joins the cell
body.
Myelin Sheath Answer - Membrane made of a lipid material called myelin
, May wrap around the axon
Nodes of Ranvier Answer - Gaps in the myelin sheath to which voltage-gated
sodium channels are confined.
Myelin Answer - Produced by Schwann Cells
Nutrient exchange is not possible through myelin sheath\
Acts as an insulator that allows an action potential to leap between segments
rather than flowing along the entire length of the membrane
Disorders of the myelin sheath Answer - MS
Guillain-Barre Syndrome
Four basic types of cell configuration Answer - Unipolar
Pseudounipolar
Bipolar
Multipolar
Unipolar Neurons Answer - One process, an axon, which branches shortly after
leaving the cell body
EX: retina
UPDATE | WITH COMPLETE SOLUTION.
Central Nervous System Answer - Consists of the brain and spinal cord,
enclosed within protective cranial vault and vertebrae
Different pathways in the peripheral nervous system? Answer - Afferent
(ascending) - carry sensory impulses toward CNS
Efferent (descending) - innervate skeletal muscle or effector organs by
transmitting motor impulses away from CNS
Somatic Nervous System Answer - Pathways that regulate voluntary motor
control
Autonomic Nervous System Answer - Regulation of the body's internal
environment (viscera) through involuntary control of organs
Further divided into sympathetic and parasympathetic
Two cells that constitute nervous tissue? Answer - Neurons
,Nonneuronal neuroglial cells
Neuron Answer - primary cell of the nervous system
electrically excitable cell and transmits and receives information
Neurological Cells Answer - provide structural support, protection, and
nutrition for neurons
facilitate neurotransmission
3 parts of a neuron Answer - cell body, dendrites, axon
Cell Body Answer - •Mostly located in the CNS
•Cell bodies in the PNS are found in groups called ganglia
Ganglia Answer - Clusters of cell bodies in the PNS
Dendrites Answer - Extensions that carry nerve impulses toward the cell body
Axons Answer - long conductive projections that carry nerve impulses away
from the cell body
Axon Hillock Answer - Cone shaped region of an axon where it joins the cell
body.
Myelin Sheath Answer - Membrane made of a lipid material called myelin
, May wrap around the axon
Nodes of Ranvier Answer - Gaps in the myelin sheath to which voltage-gated
sodium channels are confined.
Myelin Answer - Produced by Schwann Cells
Nutrient exchange is not possible through myelin sheath\
Acts as an insulator that allows an action potential to leap between segments
rather than flowing along the entire length of the membrane
Disorders of the myelin sheath Answer - MS
Guillain-Barre Syndrome
Four basic types of cell configuration Answer - Unipolar
Pseudounipolar
Bipolar
Multipolar
Unipolar Neurons Answer - One process, an axon, which branches shortly after
leaving the cell body
EX: retina
