CALIFORNIA PHYSIOLOGICAL
PSYCHOLOGY EXAM WITH QUESTIONS AND
VERIFIED ANSWERS, PLUS DETAILED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. Which brain structure is most directly involved in maintaining
homeostasis by regulating hunger, thirst, body temperature, and
endocrine activity?
A. Hippocampus
B. Hypothalamus
C. Amygdala
D. Caudate nucleus
Answer: B. Hypothalamus
Rationale: The hypothalamus is a central regulator of homeostasis. It
monitors internal physiological conditions and influences autonomic,
endocrine, and behavioral responses. It regulates temperature,
hunger, thirst, sexual behavior, circadian rhythms, and pituitary
hormone release. The hippocampus is primarily associated with
memory, the amygdala with emotional processing, and the caudate
with motor learning and habit formation.
2. A patient sustains damage to the hippocampus. Which deficit
would most likely be observed?
A. Inability to regulate blood pressure
B. Severe impairment in forming new explicit memories
1
,C. Loss of basic reflexes
D. Complete inability to experience fear
Answer: B. Severe impairment in forming new explicit memories
Rationale: The hippocampus is critically involved in the formation and
consolidation of new declarative or explicit memories. Damage can
produce anterograde amnesia, in which the person has difficulty
forming new long-term memories. Other brain systems may continue
to support procedural learning and some forms of conditioning.
3. Which neurotransmitter is most strongly associated with
neuromuscular transmission at the skeletal muscle?
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Answer: C. Acetylcholine
Rationale: Acetylcholine is released by motor neurons at the
neuromuscular junction. It binds primarily to nicotinic acetylcholine
receptors on skeletal muscle fibers, producing depolarization and
initiating muscle contraction.
4. Which part of the neuron normally receives incoming signals from
other neurons?
A. Axon terminal
B. Myelin sheath
C. Dendrites
D. Node of Ranvier
Answer: C. Dendrites
2
,Rationale: Dendrites are specialized to receive synaptic input from
other neurons. The cell body integrates many of these signals, while
the axon conducts action potentials toward axon terminals, where
neurotransmitters may be released.
5. What is the primary function of myelin surrounding an axon?
A. Producing neurotransmitters
B. Increasing the speed of action potential conduction
C. Preventing neurotransmitter release
D. Generating hormones
Answer: B. Increasing the speed of action potential conduction
Rationale: Myelin electrically insulates the axon and allows action
potentials to propagate rapidly through saltatory conduction between
nodes of Ranvier. In the central nervous system, myelin is produced by
oligodendrocytes; in the peripheral nervous system, it is produced by
Schwann cells.
6. Which glial cell forms myelin in the central nervous system?
A. Schwann cell
B. Astrocyte
C. Oligodendrocyte
D. Microglial cell
Answer: C. Oligodendrocyte
Rationale: Oligodendrocytes produce myelin in the brain and spinal
cord. Schwann cells perform the corresponding function in the
peripheral nervous system. Astrocytes support neurons and contribute
to the blood-brain barrier, while microglia provide immune-related
functions.
3
, 7. A drug blocks voltage-gated sodium channels in an axon. What
would most directly happen?
A. Action potential propagation would be impaired
B. Neurotransmitter synthesis would increase
C. Myelin production would increase
D. Resting membrane potential would become permanently positive
Answer: A. Action potential propagation would be impaired
Rationale: Voltage-gated sodium channels are essential for the rapid
depolarization phase of an action potential. Blocking these channels
prevents or substantially disrupts action potential generation and
propagation along the axon.
8. Which neurotransmitter is the primary inhibitory neurotransmitter
in the adult central nervous system?
A. Glutamate
B. GABA
C. Dopamine
D. Acetylcholine
Answer: B. GABA
Rationale: Gamma-aminobutyric acid, or GABA, is the principal
inhibitory neurotransmitter in the adult CNS. Activation of many
GABA receptors increases neuronal inhibition, reducing the likelihood
that the postsynaptic neuron will generate an action potential.
9. Which neurotransmitter is generally considered the major
excitatory neurotransmitter in the central nervous system?
4
PSYCHOLOGY EXAM WITH QUESTIONS AND
VERIFIED ANSWERS, PLUS DETAILED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. Which brain structure is most directly involved in maintaining
homeostasis by regulating hunger, thirst, body temperature, and
endocrine activity?
A. Hippocampus
B. Hypothalamus
C. Amygdala
D. Caudate nucleus
Answer: B. Hypothalamus
Rationale: The hypothalamus is a central regulator of homeostasis. It
monitors internal physiological conditions and influences autonomic,
endocrine, and behavioral responses. It regulates temperature,
hunger, thirst, sexual behavior, circadian rhythms, and pituitary
hormone release. The hippocampus is primarily associated with
memory, the amygdala with emotional processing, and the caudate
with motor learning and habit formation.
2. A patient sustains damage to the hippocampus. Which deficit
would most likely be observed?
A. Inability to regulate blood pressure
B. Severe impairment in forming new explicit memories
1
,C. Loss of basic reflexes
D. Complete inability to experience fear
Answer: B. Severe impairment in forming new explicit memories
Rationale: The hippocampus is critically involved in the formation and
consolidation of new declarative or explicit memories. Damage can
produce anterograde amnesia, in which the person has difficulty
forming new long-term memories. Other brain systems may continue
to support procedural learning and some forms of conditioning.
3. Which neurotransmitter is most strongly associated with
neuromuscular transmission at the skeletal muscle?
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Answer: C. Acetylcholine
Rationale: Acetylcholine is released by motor neurons at the
neuromuscular junction. It binds primarily to nicotinic acetylcholine
receptors on skeletal muscle fibers, producing depolarization and
initiating muscle contraction.
4. Which part of the neuron normally receives incoming signals from
other neurons?
A. Axon terminal
B. Myelin sheath
C. Dendrites
D. Node of Ranvier
Answer: C. Dendrites
2
,Rationale: Dendrites are specialized to receive synaptic input from
other neurons. The cell body integrates many of these signals, while
the axon conducts action potentials toward axon terminals, where
neurotransmitters may be released.
5. What is the primary function of myelin surrounding an axon?
A. Producing neurotransmitters
B. Increasing the speed of action potential conduction
C. Preventing neurotransmitter release
D. Generating hormones
Answer: B. Increasing the speed of action potential conduction
Rationale: Myelin electrically insulates the axon and allows action
potentials to propagate rapidly through saltatory conduction between
nodes of Ranvier. In the central nervous system, myelin is produced by
oligodendrocytes; in the peripheral nervous system, it is produced by
Schwann cells.
6. Which glial cell forms myelin in the central nervous system?
A. Schwann cell
B. Astrocyte
C. Oligodendrocyte
D. Microglial cell
Answer: C. Oligodendrocyte
Rationale: Oligodendrocytes produce myelin in the brain and spinal
cord. Schwann cells perform the corresponding function in the
peripheral nervous system. Astrocytes support neurons and contribute
to the blood-brain barrier, while microglia provide immune-related
functions.
3
, 7. A drug blocks voltage-gated sodium channels in an axon. What
would most directly happen?
A. Action potential propagation would be impaired
B. Neurotransmitter synthesis would increase
C. Myelin production would increase
D. Resting membrane potential would become permanently positive
Answer: A. Action potential propagation would be impaired
Rationale: Voltage-gated sodium channels are essential for the rapid
depolarization phase of an action potential. Blocking these channels
prevents or substantially disrupts action potential generation and
propagation along the axon.
8. Which neurotransmitter is the primary inhibitory neurotransmitter
in the adult central nervous system?
A. Glutamate
B. GABA
C. Dopamine
D. Acetylcholine
Answer: B. GABA
Rationale: Gamma-aminobutyric acid, or GABA, is the principal
inhibitory neurotransmitter in the adult CNS. Activation of many
GABA receptors increases neuronal inhibition, reducing the likelihood
that the postsynaptic neuron will generate an action potential.
9. Which neurotransmitter is generally considered the major
excitatory neurotransmitter in the central nervous system?
4
