BIOS 252 Exam Prep Questions and Answers with Rationales |
CHAMBERLAIN UNIVERSITY
Question 1. The principal abnormality is disturbed endocrine/autonomic homeostasis. Which option
provides the best anatomical or physiologic localization?
A. oculomotor nerve (CN III)
B. vestibulocochlear nerve (CN VIII)
C. hypothalamus
D. pia mater
Correct Answer: C. hypothalamus
Explanation: The defining role of hypothalamus is that it coordinates endocrine and autonomic homeostasis including
temperature, hunger, thirst, and pituitary control. Its relevant anatomical context is inferior to the thalamus and connected
to the pituitary. The alternatives do not match the tested function and context as well.
Question 2. If the activity of atrial natriuretic peptide (ANP) is specifically inhibited, which physiologic
effect should decline first?
A. Stimulates red blood cell production in bone marrow in response to reduced renal oxygen delivery.
B. Promotes sodium and water loss and opposes volume-expanding signals.
C. Signals energy stores to the hypothalamus and tends to suppress appetite when effective.
D. Initiates the renin-angiotensin-aldosterone system when renal perfusion or sodium delivery is reduced.
Correct Answer: B. Promotes sodium and water loss and opposes volume-expanding signals.
Explanation: The defining role of atrial natriuretic peptide (ANP) is that it promotes sodium and water loss and opposes
volume-expanding signals. Its relevant anatomical context is from atrial cardiomyocytes in response to stretch. The
alternatives do not match the tested function and context as well.
Question 3. A focused lesion produces wrist drop and weakness of extension. Which component should be
suspected first?
A. femoral nerve
B. ulnar nerve
C. tibial nerve
D. radial nerve
Correct Answer: D. radial nerve
Explanation: The defining role of radial nerve is that it innervates major extensor muscles of the arm and forearm and
carries sensation from part of the posterior limb. Its relevant anatomical context is from the brachial plexus to the posterior
upper limb. The alternatives do not match the tested function and context as well.
Question 4. Which dysfunction best localizes to saltatory conduction when the finding is slower
propagation when myelin is lost?
A. saltatory conduction
B. potassium leak channels
C. cell body (soma)
D. ependymal cell
Correct Answer: A. saltatory conduction
Explanation: The defining role of saltatory conduction is that it allows action potentials to appear to jump from node to
node along a myelinated axon. Its relevant anatomical context is along myelinated axons. The alternatives do not match
the tested function and context as well.
,Question 5. Using both anatomical context and physiology, identify the component linked to at or near
body surfaces and special sense organs that detects stimuli arising outside the body.
A. exteroceptor
B. cornea
C. oval window
D. ciliary muscle
Correct Answer: A. exteroceptor
Explanation: The defining role of exteroceptor is that it detects stimuli arising outside the body. Its relevant anatomical
context is at or near body surfaces and special sense organs. The alternatives do not match the tested function and context
as well.
Question 6. Selective loss of endocrine gland leaves neighboring components intact. Which normal role is
most directly compromised?
A. Releases hormones into interstitial fluid and blood rather than through a duct.
B. Supports the stress response, increases gluconeogenic capacity, and has anti-inflammatory effects.
C. Increases renal sodium reabsorption and potassium secretion, helping support extracellular fluid volume and blood
pressure.
D. Secretes insulin in response to rising blood glucose and other nutrient signals.
Correct Answer: A. Releases hormones into interstitial fluid and blood rather than through a duct.
Explanation: The defining role of endocrine gland is that it releases hormones into interstitial fluid and blood rather than
through a duct. Its relevant anatomical context is in ductless hormone-secreting tissues. The alternatives do not match the
tested function and context as well.
Question 7. Which answer satisfies both features - association with immediately deep to the skull in the
cranium and the ability to forms the tough outer meningeal layer and creates cranial dural folds and
venous sinuses?
A. optic nerve (CN II)
B. Wernicke area
C. dura mater
D. norepinephrine at most sympathetic effectors
Correct Answer: C. dura mater
Explanation: The defining role of dura mater is that it forms the tough outer meningeal layer and creates cranial dural
folds and venous sinuses. Its relevant anatomical context is immediately deep to the skull in the cranium. The alternatives
do not match the tested function and context as well.
Question 8. Which dysfunction best localizes to voltage-gated sodium channels when the finding is loss of
the rapid depolarizing upstroke of the action potential?
A. voltage-gated sodium channels
B. voltage-gated potassium channels
C. absolute refractory period
D. relative refractory period
Correct Answer: A. voltage-gated sodium channels
Explanation: The defining role of voltage-gated sodium channels is that it open rapidly near threshold and produce the
rising depolarizing phase of an action potential. Its relevant anatomical context is densely present in excitable axonal
membrane. The alternatives do not match the tested function and context as well.
,Question 9. A learner must combine location and function. Which option is associated with wrapping
around the fibular neck before dividing and also supplies pathways to anterior and lateral leg muscles
through its branches?
A. ulnar nerve
B. common fibular nerve
C. sciatic nerve
D. median nerve
Correct Answer: B. common fibular nerve
Explanation: The defining role of common fibular nerve is that it supplies pathways to anterior and lateral leg muscles
through its branches. Its relevant anatomical context is wrapping around the fibular neck before dividing. The alternatives
do not match the tested function and context as well.
Question 10. Selective loss of retinal bipolar cell leaves neighboring components intact. Which normal role
is most directly compromised?
A. Allows nasal retinal fibers to cross while temporal retinal fibers remain uncrossed.
B. Relays most visual information from optic tract to visual cortex.
C. Relays signals from photoreceptors toward ganglion cells.
D. Generates action potentials whose axons form the optic nerve.
Correct Answer: C. Relays signals from photoreceptors toward ganglion cells.
Explanation: The defining role of retinal bipolar cell is that it relays signals from photoreceptors toward ganglion cells. Its
relevant anatomical context is within the retina between photoreceptors and ganglion cells. The alternatives do not match
the tested function and context as well.
Question 11. A patient develops greater exposure of neural tissue to blood-borne substances if disrupted.
Which component is most likely impaired?
A. blood-brain barrier
B. midbrain
C. hypoglossal nerve (CN XII)
D. cerebral aqueduct
Correct Answer: A. blood-brain barrier
Explanation: The defining role of blood-brain barrier is that it restricts movement of many substances from blood into
CNS extracellular fluid through tight endothelial junctions supported by astrocytes. Its relevant anatomical context is at
CNS capillary interfaces. The alternatives do not match the tested function and context as well.
Question 12. The principal abnormality is slowed metabolism, cold intolerance, and fatigue when
deficient. Which option provides the best anatomical or physiologic localization?
A. T3 and T4
B. steroid hormone
C. parathyroid hormone (PTH)
D. melatonin
Correct Answer: A. T3 and T4
Explanation: The defining role of T3 and T4 is that it increase basal metabolic activity and support growth and
nervous-system development. Its relevant anatomical context is from thyroid follicular cells to many body tissues. The
alternatives do not match the tested function and context as well.
, Question 13. Which answer satisfies both features - association with from anterior tongue taste receptors
toward the brainstem and the ability to carries taste from the anterior two-thirds of the tongue through
CN VII?
A. fungiform papilla
B. vallate papilla
C. facial nerve taste pathway
D. taste bud
Correct Answer: C. facial nerve taste pathway
Explanation: The defining role of facial nerve taste pathway is that it carries taste from the anterior two-thirds of the
tongue through CN VII. Its relevant anatomical context is from anterior tongue taste receptors toward the brainstem. The
alternatives do not match the tested function and context as well.
Question 14. An experiment selectively blocks pseudounipolar neuron. Which normal function is most
directly reduced?
A. Open rapidly near threshold and produce the rising depolarizing phase of an action potential.
B. Removes transmitter from the synaptic cleft by transporting it into neurons or glia.
C. Is an all-or-none regenerative signal that propagates without decrement along an axon.
D. Carries general sensory information with a process that bifurcates into peripheral and central branches.
Correct Answer: D. Carries general sensory information with a process that bifurcates into peripheral and
central branches.
Explanation: The defining role of pseudounipolar neuron is that it carries general sensory information with a process that
bifurcates into peripheral and central branches. Its relevant anatomical context is in sensory ganglia such as dorsal root
ganglia. The alternatives do not match the tested function and context as well.
Question 15. A patient develops reduced pain and temperature sensation on the side opposite a spinal cord
lesion below the crossing. Which component is most likely impaired?
A. dorsal root ganglion
B. anterolateral/spinothalamic pathway
C. spinal nerve
D. common fibular nerve
Correct Answer: B. anterolateral/spinothalamic pathway
Explanation: The defining role of anterolateral/spinothalamic pathway is that it carries pain, temperature, and crude touch
information toward the brain. Its relevant anatomical context is in the anterolateral white matter after crossing within the
spinal cord. The alternatives do not match the tested function and context as well.
Question 16. Which dysfunction best localizes to abducens nerve (CN VI) when the finding is inability to
abduct the affected eye?
A. vestibulocochlear nerve (CN VIII)
B. abducens nerve (CN VI)
C. trigeminal nerve (CN V)
D. oculomotor nerve (CN III)
Correct Answer: B. abducens nerve (CN VI)
Explanation: The defining role of abducens nerve (CN VI) is that it innervates the lateral rectus muscle to abduct the eye.
Its relevant anatomical context is from the pons to the orbit. The alternatives do not match the tested function and context
as well.
CHAMBERLAIN UNIVERSITY
Question 1. The principal abnormality is disturbed endocrine/autonomic homeostasis. Which option
provides the best anatomical or physiologic localization?
A. oculomotor nerve (CN III)
B. vestibulocochlear nerve (CN VIII)
C. hypothalamus
D. pia mater
Correct Answer: C. hypothalamus
Explanation: The defining role of hypothalamus is that it coordinates endocrine and autonomic homeostasis including
temperature, hunger, thirst, and pituitary control. Its relevant anatomical context is inferior to the thalamus and connected
to the pituitary. The alternatives do not match the tested function and context as well.
Question 2. If the activity of atrial natriuretic peptide (ANP) is specifically inhibited, which physiologic
effect should decline first?
A. Stimulates red blood cell production in bone marrow in response to reduced renal oxygen delivery.
B. Promotes sodium and water loss and opposes volume-expanding signals.
C. Signals energy stores to the hypothalamus and tends to suppress appetite when effective.
D. Initiates the renin-angiotensin-aldosterone system when renal perfusion or sodium delivery is reduced.
Correct Answer: B. Promotes sodium and water loss and opposes volume-expanding signals.
Explanation: The defining role of atrial natriuretic peptide (ANP) is that it promotes sodium and water loss and opposes
volume-expanding signals. Its relevant anatomical context is from atrial cardiomyocytes in response to stretch. The
alternatives do not match the tested function and context as well.
Question 3. A focused lesion produces wrist drop and weakness of extension. Which component should be
suspected first?
A. femoral nerve
B. ulnar nerve
C. tibial nerve
D. radial nerve
Correct Answer: D. radial nerve
Explanation: The defining role of radial nerve is that it innervates major extensor muscles of the arm and forearm and
carries sensation from part of the posterior limb. Its relevant anatomical context is from the brachial plexus to the posterior
upper limb. The alternatives do not match the tested function and context as well.
Question 4. Which dysfunction best localizes to saltatory conduction when the finding is slower
propagation when myelin is lost?
A. saltatory conduction
B. potassium leak channels
C. cell body (soma)
D. ependymal cell
Correct Answer: A. saltatory conduction
Explanation: The defining role of saltatory conduction is that it allows action potentials to appear to jump from node to
node along a myelinated axon. Its relevant anatomical context is along myelinated axons. The alternatives do not match
the tested function and context as well.
,Question 5. Using both anatomical context and physiology, identify the component linked to at or near
body surfaces and special sense organs that detects stimuli arising outside the body.
A. exteroceptor
B. cornea
C. oval window
D. ciliary muscle
Correct Answer: A. exteroceptor
Explanation: The defining role of exteroceptor is that it detects stimuli arising outside the body. Its relevant anatomical
context is at or near body surfaces and special sense organs. The alternatives do not match the tested function and context
as well.
Question 6. Selective loss of endocrine gland leaves neighboring components intact. Which normal role is
most directly compromised?
A. Releases hormones into interstitial fluid and blood rather than through a duct.
B. Supports the stress response, increases gluconeogenic capacity, and has anti-inflammatory effects.
C. Increases renal sodium reabsorption and potassium secretion, helping support extracellular fluid volume and blood
pressure.
D. Secretes insulin in response to rising blood glucose and other nutrient signals.
Correct Answer: A. Releases hormones into interstitial fluid and blood rather than through a duct.
Explanation: The defining role of endocrine gland is that it releases hormones into interstitial fluid and blood rather than
through a duct. Its relevant anatomical context is in ductless hormone-secreting tissues. The alternatives do not match the
tested function and context as well.
Question 7. Which answer satisfies both features - association with immediately deep to the skull in the
cranium and the ability to forms the tough outer meningeal layer and creates cranial dural folds and
venous sinuses?
A. optic nerve (CN II)
B. Wernicke area
C. dura mater
D. norepinephrine at most sympathetic effectors
Correct Answer: C. dura mater
Explanation: The defining role of dura mater is that it forms the tough outer meningeal layer and creates cranial dural
folds and venous sinuses. Its relevant anatomical context is immediately deep to the skull in the cranium. The alternatives
do not match the tested function and context as well.
Question 8. Which dysfunction best localizes to voltage-gated sodium channels when the finding is loss of
the rapid depolarizing upstroke of the action potential?
A. voltage-gated sodium channels
B. voltage-gated potassium channels
C. absolute refractory period
D. relative refractory period
Correct Answer: A. voltage-gated sodium channels
Explanation: The defining role of voltage-gated sodium channels is that it open rapidly near threshold and produce the
rising depolarizing phase of an action potential. Its relevant anatomical context is densely present in excitable axonal
membrane. The alternatives do not match the tested function and context as well.
,Question 9. A learner must combine location and function. Which option is associated with wrapping
around the fibular neck before dividing and also supplies pathways to anterior and lateral leg muscles
through its branches?
A. ulnar nerve
B. common fibular nerve
C. sciatic nerve
D. median nerve
Correct Answer: B. common fibular nerve
Explanation: The defining role of common fibular nerve is that it supplies pathways to anterior and lateral leg muscles
through its branches. Its relevant anatomical context is wrapping around the fibular neck before dividing. The alternatives
do not match the tested function and context as well.
Question 10. Selective loss of retinal bipolar cell leaves neighboring components intact. Which normal role
is most directly compromised?
A. Allows nasal retinal fibers to cross while temporal retinal fibers remain uncrossed.
B. Relays most visual information from optic tract to visual cortex.
C. Relays signals from photoreceptors toward ganglion cells.
D. Generates action potentials whose axons form the optic nerve.
Correct Answer: C. Relays signals from photoreceptors toward ganglion cells.
Explanation: The defining role of retinal bipolar cell is that it relays signals from photoreceptors toward ganglion cells. Its
relevant anatomical context is within the retina between photoreceptors and ganglion cells. The alternatives do not match
the tested function and context as well.
Question 11. A patient develops greater exposure of neural tissue to blood-borne substances if disrupted.
Which component is most likely impaired?
A. blood-brain barrier
B. midbrain
C. hypoglossal nerve (CN XII)
D. cerebral aqueduct
Correct Answer: A. blood-brain barrier
Explanation: The defining role of blood-brain barrier is that it restricts movement of many substances from blood into
CNS extracellular fluid through tight endothelial junctions supported by astrocytes. Its relevant anatomical context is at
CNS capillary interfaces. The alternatives do not match the tested function and context as well.
Question 12. The principal abnormality is slowed metabolism, cold intolerance, and fatigue when
deficient. Which option provides the best anatomical or physiologic localization?
A. T3 and T4
B. steroid hormone
C. parathyroid hormone (PTH)
D. melatonin
Correct Answer: A. T3 and T4
Explanation: The defining role of T3 and T4 is that it increase basal metabolic activity and support growth and
nervous-system development. Its relevant anatomical context is from thyroid follicular cells to many body tissues. The
alternatives do not match the tested function and context as well.
, Question 13. Which answer satisfies both features - association with from anterior tongue taste receptors
toward the brainstem and the ability to carries taste from the anterior two-thirds of the tongue through
CN VII?
A. fungiform papilla
B. vallate papilla
C. facial nerve taste pathway
D. taste bud
Correct Answer: C. facial nerve taste pathway
Explanation: The defining role of facial nerve taste pathway is that it carries taste from the anterior two-thirds of the
tongue through CN VII. Its relevant anatomical context is from anterior tongue taste receptors toward the brainstem. The
alternatives do not match the tested function and context as well.
Question 14. An experiment selectively blocks pseudounipolar neuron. Which normal function is most
directly reduced?
A. Open rapidly near threshold and produce the rising depolarizing phase of an action potential.
B. Removes transmitter from the synaptic cleft by transporting it into neurons or glia.
C. Is an all-or-none regenerative signal that propagates without decrement along an axon.
D. Carries general sensory information with a process that bifurcates into peripheral and central branches.
Correct Answer: D. Carries general sensory information with a process that bifurcates into peripheral and
central branches.
Explanation: The defining role of pseudounipolar neuron is that it carries general sensory information with a process that
bifurcates into peripheral and central branches. Its relevant anatomical context is in sensory ganglia such as dorsal root
ganglia. The alternatives do not match the tested function and context as well.
Question 15. A patient develops reduced pain and temperature sensation on the side opposite a spinal cord
lesion below the crossing. Which component is most likely impaired?
A. dorsal root ganglion
B. anterolateral/spinothalamic pathway
C. spinal nerve
D. common fibular nerve
Correct Answer: B. anterolateral/spinothalamic pathway
Explanation: The defining role of anterolateral/spinothalamic pathway is that it carries pain, temperature, and crude touch
information toward the brain. Its relevant anatomical context is in the anterolateral white matter after crossing within the
spinal cord. The alternatives do not match the tested function and context as well.
Question 16. Which dysfunction best localizes to abducens nerve (CN VI) when the finding is inability to
abduct the affected eye?
A. vestibulocochlear nerve (CN VIII)
B. abducens nerve (CN VI)
C. trigeminal nerve (CN V)
D. oculomotor nerve (CN III)
Correct Answer: B. abducens nerve (CN VI)
Explanation: The defining role of abducens nerve (CN VI) is that it innervates the lateral rectus muscle to abduct the eye.
Its relevant anatomical context is from the pons to the orbit. The alternatives do not match the tested function and context
as well.
