PURDUE BIOL 203 EXAM 3 2026/2027
WITH 450 QUESTIONS AND EXPERT-
VERIFIED CORRECT ANSWERS
Section A: General Functions and Organization of the Nervous system
What is the abbreviation of CNS stand for, and what structures constitute it?
Central Nervous System; Brain and spinal cord
What does PNS stand for and which two structures comprise it?
Peripheral Nervous System; Nerves and Ganglia
What are nerves? Is a nerve fiber the same as an axon?
Cordlike structures that conduct information; yes they are the same
What are ganglia? And gangloin?
Knotlike swelling in a nerve where the cell bodies of neurons are concentrated;
Ganglion is the singular term, referring only to one structure.
,What does afferent mean? and efferent?
In reference to CNS, afferent means "towards", efferent means "away"
Sensory information is transmitted from sensory receptors found in organs to the
CNS by afferent or efferent nerve fibers?
Afferent fibers
What do efferent nerve fibers transmit, sensory or motor info?
Motor information
What is a mixed nerve?
Those nerves that contain motor and sensory fibers
Which subdivisions of the PNS (sensory/motor, somatic/visceral) are involved in
transmitting sensory information, such as a painful stimulus from the skin to the
CNS?
Sensory Somatic
Which subdivisions of the PNS are involved in transmitting sensory information,
such as painful stimulus, from organs in the thoracic and abdominal cavities
(heartburn) to the CNS for processing?
Sensory visceral (recall the concept of viscera)
,Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the skeletal muscle for contracting?
Motor Somatic
Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the cardiac or smooth muscle for
contracting/relaxing?
Visceral Motor
Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the glands to release their contents (such as
enzymes, saliva, pancreatic juice, etc)
Motor Visceral = autonomic nervous system
Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the autonomic nervous system?
, Motor Visceral
Which subdivison if the PNS (sensory/motor, somatic/visceral) are responsible for
involuntary somatic reflexes involving skeletal muscle contraction?
Motor somatic
Which PNS subdivision handles (a) sensing a "satiated stomach" after a meal (b)
starting leg muscle contractions for kicking a ball (c) increasing heart rate (d)
controlling bowel movements?
(a) visceral sensory, (b) somatic motor, (c, d) visceral motor (ANS)
Is it possible to locate nuclei within the PNS? (not cell nuclei)
Nuclei are structures confined to the CNS
What is a tract? What is the primary differentiating factor between nerves and
tracts, particularly in terms of their locations?
Bundles of axons in the CNS. The term "nerves" refers to the same concept but in
the PNS
What term represents the equivalent of gnaglia in the CNS?
Nuclei
Section B: Gross & Microscopic Anatomy of the NS; The Neuron
What are the three types of neurons, considering their function?
WITH 450 QUESTIONS AND EXPERT-
VERIFIED CORRECT ANSWERS
Section A: General Functions and Organization of the Nervous system
What is the abbreviation of CNS stand for, and what structures constitute it?
Central Nervous System; Brain and spinal cord
What does PNS stand for and which two structures comprise it?
Peripheral Nervous System; Nerves and Ganglia
What are nerves? Is a nerve fiber the same as an axon?
Cordlike structures that conduct information; yes they are the same
What are ganglia? And gangloin?
Knotlike swelling in a nerve where the cell bodies of neurons are concentrated;
Ganglion is the singular term, referring only to one structure.
,What does afferent mean? and efferent?
In reference to CNS, afferent means "towards", efferent means "away"
Sensory information is transmitted from sensory receptors found in organs to the
CNS by afferent or efferent nerve fibers?
Afferent fibers
What do efferent nerve fibers transmit, sensory or motor info?
Motor information
What is a mixed nerve?
Those nerves that contain motor and sensory fibers
Which subdivisions of the PNS (sensory/motor, somatic/visceral) are involved in
transmitting sensory information, such as a painful stimulus from the skin to the
CNS?
Sensory Somatic
Which subdivisions of the PNS are involved in transmitting sensory information,
such as painful stimulus, from organs in the thoracic and abdominal cavities
(heartburn) to the CNS for processing?
Sensory visceral (recall the concept of viscera)
,Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the skeletal muscle for contracting?
Motor Somatic
Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the cardiac or smooth muscle for
contracting/relaxing?
Visceral Motor
Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the glands to release their contents (such as
enzymes, saliva, pancreatic juice, etc)
Motor Visceral = autonomic nervous system
Which subdivison if the PNS (sensory/motor, somatic/visceral) are involved in
relaying information from CNS to the autonomic nervous system?
, Motor Visceral
Which subdivison if the PNS (sensory/motor, somatic/visceral) are responsible for
involuntary somatic reflexes involving skeletal muscle contraction?
Motor somatic
Which PNS subdivision handles (a) sensing a "satiated stomach" after a meal (b)
starting leg muscle contractions for kicking a ball (c) increasing heart rate (d)
controlling bowel movements?
(a) visceral sensory, (b) somatic motor, (c, d) visceral motor (ANS)
Is it possible to locate nuclei within the PNS? (not cell nuclei)
Nuclei are structures confined to the CNS
What is a tract? What is the primary differentiating factor between nerves and
tracts, particularly in terms of their locations?
Bundles of axons in the CNS. The term "nerves" refers to the same concept but in
the PNS
What term represents the equivalent of gnaglia in the CNS?
Nuclei
Section B: Gross & Microscopic Anatomy of the NS; The Neuron
What are the three types of neurons, considering their function?
