BIOD 152 Module 1 Exam Essential Human Anatomy and
Physiology II Actual Exam 2026/2027 – Complete Exam-Style
Questions with Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
Section A: Nervous System Organization & Neural Tissue
Q1: Which component of a multipolar neuron receives most synaptic input and
integrates postsynaptic potentials toward the axon hillock?
A. Axon terminal
B. Dendrites and cell body [CORRECT]
C. Myelin sheath
D. Node of Ranvier
Correct Answer: B
Rationale: Dendrites and the soma provide the large receptive surface for synaptic input
and summation; axon terminals release neurotransmitter, myelin insulates, and nodes
permit saltatory conduction.
Q2: A patient has a CNS demyelinating disorder in which oligodendrocytes are injured.
Which change best explains slowed impulse conduction along myelinated axons?
A. Failure of axon terminals to release glutamate
B. Phagocytosis of debris by microglia
,C. Exposure of voltage-gated channels along demyelinated internodes with disrupted
saltatory conduction [CORRECT]
D. Increased tight-junction sealing of endothelial cells by astrocytes
Correct Answer: C
Rationale: Myelin forces action potentials to regenerate at nodes; loss of CNS myelin
disrupts saltatory conduction and slows or blocks propagation, whereas
neurotransmitter release, microglial phagocytosis, and blood-brain barrier tight
junctions do not primarily set conduction speed.
Q3: A patient recovering from meningitis has increased blood-brain barrier permeability
and edema. Which neuroglial cell is most directly responsible for inducing and
maintaining endothelial tight junctions that regulate barrier selectivity?
A. Astrocytes [CORRECT]
B. Schwann cells
C. Satellite glial cells
D. Ependymal cells
Correct Answer: A
Rationale: Astrocyte end-feet signal CNS capillary endothelial tight-junction formation;
Schwann and satellite glia are peripheral, and ependymal cells line ventricles rather than
maintain BBB tight junctions.
Q4: A patient develops descending flaccid paralysis after foodborne illness. Toxin
prevents acetylcholine release at the neuromuscular junction. Which mechanism is
impaired?
, A. Calcium-dependent exocytosis from the presynaptic terminal [CORRECT]
B. Sodium influx through voltage-gated channels at the node
C. Opening of ligand-gated sodium channels on the muscle end plate
D. Reuptake of norepinephrine into sympathetic varicosities
Correct Answer: A
Rationale: Botulinum toxin cleaves SNARE proteins and blocks Ca2+-dependent
acetylcholine vesicle release; it does not block nodal sodium influx, postsynaptic
receptor activation, or norepinephrine reuptake.
Q5: An interneuron receives two subthreshold excitatory inputs close together in time,
then fires an action potential. Which principle best explains this result?
A. Temporal summation of EPSPs bringing the axon hillock to threshold [CORRECT]
B. Absolute refractory period preventing any subsequent depolarization
C. Spatial summation limited to IPSPs at the dendritic spine
D. Myelin decreasing the length constant of the dendrite
Correct Answer: A
Rationale: Subthreshold EPSPs arriving in rapid succession summate temporally and
can reach threshold at the trigger zone; the absolute refractory period limits frequency
rather than enabling firing, IPSPs inhibit, and myelin is not primarily a postsynaptic
dendritic mechanism.
Q6: Which pairing of neuroglial cell, location, and function is correct?
Physiology II Actual Exam 2026/2027 – Complete Exam-Style
Questions with Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
Section A: Nervous System Organization & Neural Tissue
Q1: Which component of a multipolar neuron receives most synaptic input and
integrates postsynaptic potentials toward the axon hillock?
A. Axon terminal
B. Dendrites and cell body [CORRECT]
C. Myelin sheath
D. Node of Ranvier
Correct Answer: B
Rationale: Dendrites and the soma provide the large receptive surface for synaptic input
and summation; axon terminals release neurotransmitter, myelin insulates, and nodes
permit saltatory conduction.
Q2: A patient has a CNS demyelinating disorder in which oligodendrocytes are injured.
Which change best explains slowed impulse conduction along myelinated axons?
A. Failure of axon terminals to release glutamate
B. Phagocytosis of debris by microglia
,C. Exposure of voltage-gated channels along demyelinated internodes with disrupted
saltatory conduction [CORRECT]
D. Increased tight-junction sealing of endothelial cells by astrocytes
Correct Answer: C
Rationale: Myelin forces action potentials to regenerate at nodes; loss of CNS myelin
disrupts saltatory conduction and slows or blocks propagation, whereas
neurotransmitter release, microglial phagocytosis, and blood-brain barrier tight
junctions do not primarily set conduction speed.
Q3: A patient recovering from meningitis has increased blood-brain barrier permeability
and edema. Which neuroglial cell is most directly responsible for inducing and
maintaining endothelial tight junctions that regulate barrier selectivity?
A. Astrocytes [CORRECT]
B. Schwann cells
C. Satellite glial cells
D. Ependymal cells
Correct Answer: A
Rationale: Astrocyte end-feet signal CNS capillary endothelial tight-junction formation;
Schwann and satellite glia are peripheral, and ependymal cells line ventricles rather than
maintain BBB tight junctions.
Q4: A patient develops descending flaccid paralysis after foodborne illness. Toxin
prevents acetylcholine release at the neuromuscular junction. Which mechanism is
impaired?
, A. Calcium-dependent exocytosis from the presynaptic terminal [CORRECT]
B. Sodium influx through voltage-gated channels at the node
C. Opening of ligand-gated sodium channels on the muscle end plate
D. Reuptake of norepinephrine into sympathetic varicosities
Correct Answer: A
Rationale: Botulinum toxin cleaves SNARE proteins and blocks Ca2+-dependent
acetylcholine vesicle release; it does not block nodal sodium influx, postsynaptic
receptor activation, or norepinephrine reuptake.
Q5: An interneuron receives two subthreshold excitatory inputs close together in time,
then fires an action potential. Which principle best explains this result?
A. Temporal summation of EPSPs bringing the axon hillock to threshold [CORRECT]
B. Absolute refractory period preventing any subsequent depolarization
C. Spatial summation limited to IPSPs at the dendritic spine
D. Myelin decreasing the length constant of the dendrite
Correct Answer: A
Rationale: Subthreshold EPSPs arriving in rapid succession summate temporally and
can reach threshold at the trigger zone; the absolute refractory period limits frequency
rather than enabling firing, IPSPs inhibit, and myelin is not primarily a postsynaptic
dendritic mechanism.
Q6: Which pairing of neuroglial cell, location, and function is correct?
