RIO SALADO BIO 201 ANATOMY AND
PHYSIOLOGY FINAL PAPER 2026 COMPLETE
QUESTIONS AND ANSWERS
◉ Match the names of the supporting cells with the appropriate
descriptions:
A. Astrocyte B. Ependymal cell C. Microglia
D. Oligodendrocyte E. Satellite cell F. Schwann cell
1) myelinates nerve fibers in the CNS
2) lines brain cavities
3) myelinates nerve fibers in the PNS
4) CNS phagocytes
5) Helps regulate the ionic composition of CNS extracellular fluid
6) Surrounds neuron cell bodies in the PNS. Answer: D.
Oligodendrocyte - 1) myelinates nerve fibers in the CNS
B. Ependymal cell - 2) lines brain cavities
F. Schwann cell - 3) myelinates nerve fibers in the PNS
C. Microglia - 4) CNS phagocytes
A. Astrocyte - 5) Helps regulate the ionic composition of CNS
extracellular fluid
E. Satellite cell - 6) Surrounds neuron cell bodies in the PNS
,◉ What type of current flows through the axolemma during the
steep phase of repolarization?
A) chiefly a sodium current
B) chiefly a potassium current
C) sodium and potassium currents at approximately the same
magnitude.. Answer: B) chiefly a potassium current
◉ Assume that an EPSP is being generated on the dendritic
membrane. Which will occur?
A) specific NA+ channels will open
B) specific K+ channels will open
C) a single type of channel will open, permitting simultaneous flow
of NA+ and K+
D) NA+ channels will open first and then close as K+ channels open.
Answer: C) a single type of channel will open, permitting
simultaneous flow of NA+ and K+
◉ The velocity of nerve impulse conduction is greatest in
A) heavily myelinated, large diameter fibers
,B) myelinated small diameter fibers
C) unmyelinated large diameter fibers. Answer: A) heavily
myelinated, large diameter fibers
◉ Chemical synapses are characterized by all of the following
EXCEPT
A) The release of neurotransmitter by the presynaptic membranes
B) postsynaptic membranes bearing receptors that bind
neurotransmitter
C) ions flowing through protein channels from the presynaptic to the
postsynaptic neuron
D) a fluid-filled gap separating the neurons. Answer: C) ions flowing
through protein channels from the presynaptic to the postsynaptic
neuron
◉ Biogenic amine neurotransmitters include all of the following
EXCEPT
A) norepinephrine
B) acetylcholine
C) dopamine
D) serotonin. Answer: B) acetylcholine
, ◉ Which neuropeptide acts as natural opiates?
A) substance P
B) somatostatin
C) cholecystokinin
D) enkephalins. Answer: D) enkephalins
◉ Why does inhibition of acetylcholinesterase by poisoning, block
neurotransmission at the neuromuscular junction?
A) ACh is no longer released by the presynaptic terminal
B) ACh synthesis in the presynaptic terminal is blocked
C) ACh is not degraded, hence prolonged depolarization is enforced
on the postsynaptic neuron
D) ACh is blocked from attaching to the postsynaptic ACh receptors.
Answer: C) ACh is not degraded, hence prolonged depolarization is
enforced on the postsynaptic neuron
◉ What anatomical region of a multipolar neuron has the lowest
threshold for generating an AP?
A) soma
B) dendrites
PHYSIOLOGY FINAL PAPER 2026 COMPLETE
QUESTIONS AND ANSWERS
◉ Match the names of the supporting cells with the appropriate
descriptions:
A. Astrocyte B. Ependymal cell C. Microglia
D. Oligodendrocyte E. Satellite cell F. Schwann cell
1) myelinates nerve fibers in the CNS
2) lines brain cavities
3) myelinates nerve fibers in the PNS
4) CNS phagocytes
5) Helps regulate the ionic composition of CNS extracellular fluid
6) Surrounds neuron cell bodies in the PNS. Answer: D.
Oligodendrocyte - 1) myelinates nerve fibers in the CNS
B. Ependymal cell - 2) lines brain cavities
F. Schwann cell - 3) myelinates nerve fibers in the PNS
C. Microglia - 4) CNS phagocytes
A. Astrocyte - 5) Helps regulate the ionic composition of CNS
extracellular fluid
E. Satellite cell - 6) Surrounds neuron cell bodies in the PNS
,◉ What type of current flows through the axolemma during the
steep phase of repolarization?
A) chiefly a sodium current
B) chiefly a potassium current
C) sodium and potassium currents at approximately the same
magnitude.. Answer: B) chiefly a potassium current
◉ Assume that an EPSP is being generated on the dendritic
membrane. Which will occur?
A) specific NA+ channels will open
B) specific K+ channels will open
C) a single type of channel will open, permitting simultaneous flow
of NA+ and K+
D) NA+ channels will open first and then close as K+ channels open.
Answer: C) a single type of channel will open, permitting
simultaneous flow of NA+ and K+
◉ The velocity of nerve impulse conduction is greatest in
A) heavily myelinated, large diameter fibers
,B) myelinated small diameter fibers
C) unmyelinated large diameter fibers. Answer: A) heavily
myelinated, large diameter fibers
◉ Chemical synapses are characterized by all of the following
EXCEPT
A) The release of neurotransmitter by the presynaptic membranes
B) postsynaptic membranes bearing receptors that bind
neurotransmitter
C) ions flowing through protein channels from the presynaptic to the
postsynaptic neuron
D) a fluid-filled gap separating the neurons. Answer: C) ions flowing
through protein channels from the presynaptic to the postsynaptic
neuron
◉ Biogenic amine neurotransmitters include all of the following
EXCEPT
A) norepinephrine
B) acetylcholine
C) dopamine
D) serotonin. Answer: B) acetylcholine
, ◉ Which neuropeptide acts as natural opiates?
A) substance P
B) somatostatin
C) cholecystokinin
D) enkephalins. Answer: D) enkephalins
◉ Why does inhibition of acetylcholinesterase by poisoning, block
neurotransmission at the neuromuscular junction?
A) ACh is no longer released by the presynaptic terminal
B) ACh synthesis in the presynaptic terminal is blocked
C) ACh is not degraded, hence prolonged depolarization is enforced
on the postsynaptic neuron
D) ACh is blocked from attaching to the postsynaptic ACh receptors.
Answer: C) ACh is not degraded, hence prolonged depolarization is
enforced on the postsynaptic neuron
◉ What anatomical region of a multipolar neuron has the lowest
threshold for generating an AP?
A) soma
B) dendrites
