BIO105 | BIO105 Anatomy and Physiology 1 Exam
3 Version 2 | Questions with Correct Answers and
Expert Explanation for Each Question | Saint Paul’s
School of Nursing
1. Which lobe of the cerebrum is primarily responsible for motor function, problem
solving, and personality?
A. Occipital Lobe
B. Frontal Lobe
C. Parietal Lobe
D. Temporal Lobe
Correct Answer: B
Expert Explanation: The frontal lobe is the largest part of the brain and controls
voluntary motor activity. It contains the primary motor cortex which initiates
muscle movement. Higher cognitive functions like decision-making and logic are
localized here. Damage to this area can result in significant changes in behavioral
characteristics. It is also the site of Broca’s area for speech production.
2. The cerebrospinal fluid (CSF) is primarily produced by which structure within the
brain?
A. Choroid plexus
,B. Arachnoid villi
C. Corpus callosum
D. Cerebral aqueduct
Correct Answer: A
Expert Explanation: The choroid plexus consists of specialized capillaries and
ependymal cells. It is located within the ventricles of the brain. This structure filters
blood plasma to create the cerebrospinal fluid. CSF provides buoyancy and physical
protection to the nervous tissue. Proper production and drainage are essential to
maintain intracranial pressure.
3. Between which layers of the meninges does the cerebrospinal fluid circulate?
A. Arachnoid mater and pia mater
B. Pia mater and the brain surface
C. Dura mater and arachnoid mater
D. The periosteal and meningeal dura
Correct Answer: A
Expert Explanation: The subarachnoid space is the interval located between the
middle and inner meningeal layers. These layers are specifically the arachnoid
mater and the pia mater. This space contains the web-like filaments that give the
,arachnoid its name. It acts as a conduit for the circulation of CSF around the CNS.
Arteries and veins supplying the brain also pass through this space.
4. Which region of the brainstem contains the vital centers for regulating heart rate
and respiration?
A. Medulla oblongata
B. Pons
C. Midbrain
D. Thalamus
Correct Answer: A
Expert Explanation: The medulla oblongata is the most inferior part of the
brainstem. It houses the cardiac center which regulates the force and rate of
heartbeats. It also contains the respiratory center that controls the rhythm of
breathing. Damage to the medulla is often fatal due to these critical life-support
functions. Additionally, it mediates reflexes like swallowing, coughing, and sneezing.
5. A patient presents with a loss of coordination and an unsteady gait; which part of
the brain is likely affected?
A. Basal nuclei
B. Hypothalamus
, C. Cerebellum
D. Occipital lobe
Correct Answer: C
Expert Explanation: The cerebellum is located posterior to the brainstem and is
responsible for motor coordination. It processes sensory input from proprioceptors
to maintain balance and posture. Smooth, coordinated movements are impossible
without the functional integrity of this region. Clinical assessment often involves
testing gait and finger-to-nose precision. Ataxia is a common term used to describe
the lack of coordination seen here.
6. What is the primary function of the hypothalamus?
A. Relaying sensory information to the cortex
B. Visual processing and interpretation
C. Regulation of homeostasis and the endocrine system
D. Executive decision-making
Correct Answer: C
Expert Explanation: The hypothalamus is a tiny but vital region located below the
thalamus. It serves as the main control center for the autonomic nervous system. It
regulates body temperature, thirst, hunger, and sleep-wake cycles. By controlling
3 Version 2 | Questions with Correct Answers and
Expert Explanation for Each Question | Saint Paul’s
School of Nursing
1. Which lobe of the cerebrum is primarily responsible for motor function, problem
solving, and personality?
A. Occipital Lobe
B. Frontal Lobe
C. Parietal Lobe
D. Temporal Lobe
Correct Answer: B
Expert Explanation: The frontal lobe is the largest part of the brain and controls
voluntary motor activity. It contains the primary motor cortex which initiates
muscle movement. Higher cognitive functions like decision-making and logic are
localized here. Damage to this area can result in significant changes in behavioral
characteristics. It is also the site of Broca’s area for speech production.
2. The cerebrospinal fluid (CSF) is primarily produced by which structure within the
brain?
A. Choroid plexus
,B. Arachnoid villi
C. Corpus callosum
D. Cerebral aqueduct
Correct Answer: A
Expert Explanation: The choroid plexus consists of specialized capillaries and
ependymal cells. It is located within the ventricles of the brain. This structure filters
blood plasma to create the cerebrospinal fluid. CSF provides buoyancy and physical
protection to the nervous tissue. Proper production and drainage are essential to
maintain intracranial pressure.
3. Between which layers of the meninges does the cerebrospinal fluid circulate?
A. Arachnoid mater and pia mater
B. Pia mater and the brain surface
C. Dura mater and arachnoid mater
D. The periosteal and meningeal dura
Correct Answer: A
Expert Explanation: The subarachnoid space is the interval located between the
middle and inner meningeal layers. These layers are specifically the arachnoid
mater and the pia mater. This space contains the web-like filaments that give the
,arachnoid its name. It acts as a conduit for the circulation of CSF around the CNS.
Arteries and veins supplying the brain also pass through this space.
4. Which region of the brainstem contains the vital centers for regulating heart rate
and respiration?
A. Medulla oblongata
B. Pons
C. Midbrain
D. Thalamus
Correct Answer: A
Expert Explanation: The medulla oblongata is the most inferior part of the
brainstem. It houses the cardiac center which regulates the force and rate of
heartbeats. It also contains the respiratory center that controls the rhythm of
breathing. Damage to the medulla is often fatal due to these critical life-support
functions. Additionally, it mediates reflexes like swallowing, coughing, and sneezing.
5. A patient presents with a loss of coordination and an unsteady gait; which part of
the brain is likely affected?
A. Basal nuclei
B. Hypothalamus
, C. Cerebellum
D. Occipital lobe
Correct Answer: C
Expert Explanation: The cerebellum is located posterior to the brainstem and is
responsible for motor coordination. It processes sensory input from proprioceptors
to maintain balance and posture. Smooth, coordinated movements are impossible
without the functional integrity of this region. Clinical assessment often involves
testing gait and finger-to-nose precision. Ataxia is a common term used to describe
the lack of coordination seen here.
6. What is the primary function of the hypothalamus?
A. Relaying sensory information to the cortex
B. Visual processing and interpretation
C. Regulation of homeostasis and the endocrine system
D. Executive decision-making
Correct Answer: C
Expert Explanation: The hypothalamus is a tiny but vital region located below the
thalamus. It serves as the main control center for the autonomic nervous system. It
regulates body temperature, thirst, hunger, and sleep-wake cycles. By controlling
