The sacral plexus is located in?
A. CNS
B. PNS
C. In both the CNS and PNS
D. In neither the CNS or PNS -Answer- B. PNS
Neuron cell bodies are located in?
A. CNS
B. PNS
C. In both the CNS and PNS
D. In neither the CNS or PNS -Answer- C. In both the CNS and PNS
The dorsal ramus is locat...
Biology 252 Final Exam Review Questions
and Answers 2025
The sacral plexus is located in?
A. CNS
B. PNS
C. In both the CNS and PNS
D. In neither the CNS or PNS -Answer- ✔B. PNS
Neuron cell bodies are located in?
A. CNS
B. PNS
C. In both the CNS and PNS
D. In neither the CNS or PNS -Answer- ✔C. In both the CNS and PNS
The dorsal ramus is located in?
A. CNS
B. PNS
C. In both the CNS and PNS
D. In neither the CNS or PNS -Answer- ✔B. PNS
A neuron with its cell body in the dorsal root ganglion is:
A. in the nucleus
B. a multipolar neuron
C. a mixed neuron
D. could be a somatic motor neuron
E. controls effectors -Answer- ✔D. could be a somatic motor neuron
These are sensory neurons of the eye and ear.
A. efferent
B. unipolar
C. bipolar
D. anaxonic -Answer- ✔C. bipolar
Interneuron cell bodies are found in?
A. dorsal root ganglion
B. ventral gray horn
C. dorsal gray horn
D. lateral gray horn
E. lateral white column -Answer- ✔C. dorsal gray horn
Oligodendrocytes are glial cells of _____ matter of the CNS?
a. dura
b. gray
Biology 252 Final exam review
, Biology 252 Final exam review
c. white
d. pia -Answer- ✔C. white
Nissl bodies -Answer- ✔Rough endoplasmic reticulum with ribosomes that act as the
site of protein synthesis in neurons. Found in CNS neuron somas of gray matter.
Ependymal cells -Answer- ✔In contact with CSF.
Line ventricles of brain and central canal of spinal cord. Form single layer of cuboidal to
columnar cells with cilia and microvilli. Modified epithelial cells.
Astrocytes -Answer- ✔CNS cells responsible for physical support and maintaining blood
brain barrier.
Schwann cells -Answer- ✔Supporting cells of the peripheral nervous system
responsible for the formation of myelin.
Microglia -Answer- ✔Act as phagocytes, eating damaged cells and bacteria, act as the
brains immune system
Satellite cells -Answer- ✔-Provide physical support to PNS neurons
Diffusion of what neurons across a neuron membrane causes a depolarization?
A. K+
B. Cl-
C. Na+ -Answer- ✔C. Na+
Graded potentials -Answer- ✔The magnitude of the change in membrane potential
varies with the strength of the stimulus. Includes: hyperpolarization, depolarization.
Action potentials
A. are initiated where dendrites meet the soma
B. propagate due to voltage-gated ion channels
C.vary in strength in response to stimulus
D. may travel in either direction along the axolemma
E. are sometimes initiated by hyperpolarizing the axon hillock -Answer- ✔B. propagate
due to voltage-gated ion channels
Absolute refractory period -Answer- ✔In an action potential is the limiting factor for the
frequency of action potential conduction.
Saltatory conduction -Answer- ✔Rapid transmission of a nerve impulse along an axon,
resulting from the action potential jumping from one node of Ranvier to another,
skipping the myelin-sheathed regions of membrane.
Biology 252 Final exam review
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