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ATI TEAS 7 Science Exam |
Advanced/Mixed Difficulty | 100% Pass
Guaranteed | Graded A+
1. Which of the following structures is responsible for the production of cerebrospinal fluid
(CSF)?
A. Choroid plexus
B. Arachnoid granulations
C. Cerebral aqueduct
D. Fourth ventricle
☑ Correct Answer: A
☑ Explanation: The choroid plexus, located in the ventricles of the brain, is the primary site
of CSF production. Arachnoid granulations are responsible for CSF reabsorption. The cerebral
aqueduct and fourth ventricle are passageways and reservoirs for CSF flow, not production sites.
2. In a negative feedback loop regulating body temperature, which of the following represents
the effector?
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A. The hypothalamus
B. Sweat glands
C. A set point of 98.6°F
D. An increase in core temperature
☑ Correct Answer: B
☑ Explanation: In a negative feedback loop, the effector carries out the response to
counteract the stimulus. Sweat glands are effectors that produce sweat to cool the body. The
hypothalamus is the control center, the set point is the target value, and the increased
temperature is the stimulus.
3. Which of the following is the correct sequence of events in a neural synapse?
A. Neurotransmitter release → Action potential arrives → Neurotransmitter binds to receptor
→ Postsynaptic potential
B. Action potential arrives → Neurotransmitter release → Neurotransmitter binds to receptor
→ Postsynaptic potential
C. Action potential arrives → Neurotransmitter binds to receptor → Neurotransmitter release
→ Postsynaptic potential
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D. Neurotransmitter binds to receptor → Action potential arrives → Neurotransmitter release
→ Postsynaptic potential
☑ Correct Answer: B
☑ Explanation: The correct sequence is: an action potential arrives at the presynaptic
terminal, triggering the release of neurotransmitters into the synaptic cleft. These
neurotransmitters then bind to receptors on the postsynaptic membrane, generating a
postsynaptic potential.
4. Which hormone is primarily responsible for the reabsorption of water in the collecting duct
of the nephron?
A. Aldosterone
B. Antidiuretic hormone (ADH)
C. Atrial natriuretic peptide (ANP)
D. Renin
☑ Correct Answer: B
☑ Explanation: Antidiuretic hormone (ADH) increases the permeability of the collecting
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duct to water, promoting its reabsorption and concentrating the urine. Aldosterone promotes
sodium reabsorption, ANP promotes sodium excretion, and renin is an enzyme involved in the
RAAS.
5. A patient has a deficiency in intrinsic factor. Which of the following deficiencies is most likely
to result?
A. Iron deficiency anemia
B. Folic acid deficiency
C. Vitamin B12 deficiency
D. Vitamin K deficiency
☑ Correct Answer: C
☑ Explanation: Intrinsic factor is produced by parietal cells in the stomach and is essential
for the absorption of vitamin B12 in the ileum. Without it, pernicious anemia (vitamin B12
deficiency) results.
ATI TEAS 7 Science Exam |
Advanced/Mixed Difficulty | 100% Pass
Guaranteed | Graded A+
1. Which of the following structures is responsible for the production of cerebrospinal fluid
(CSF)?
A. Choroid plexus
B. Arachnoid granulations
C. Cerebral aqueduct
D. Fourth ventricle
☑ Correct Answer: A
☑ Explanation: The choroid plexus, located in the ventricles of the brain, is the primary site
of CSF production. Arachnoid granulations are responsible for CSF reabsorption. The cerebral
aqueduct and fourth ventricle are passageways and reservoirs for CSF flow, not production sites.
2. In a negative feedback loop regulating body temperature, which of the following represents
the effector?
,2
A. The hypothalamus
B. Sweat glands
C. A set point of 98.6°F
D. An increase in core temperature
☑ Correct Answer: B
☑ Explanation: In a negative feedback loop, the effector carries out the response to
counteract the stimulus. Sweat glands are effectors that produce sweat to cool the body. The
hypothalamus is the control center, the set point is the target value, and the increased
temperature is the stimulus.
3. Which of the following is the correct sequence of events in a neural synapse?
A. Neurotransmitter release → Action potential arrives → Neurotransmitter binds to receptor
→ Postsynaptic potential
B. Action potential arrives → Neurotransmitter release → Neurotransmitter binds to receptor
→ Postsynaptic potential
C. Action potential arrives → Neurotransmitter binds to receptor → Neurotransmitter release
→ Postsynaptic potential
,3
D. Neurotransmitter binds to receptor → Action potential arrives → Neurotransmitter release
→ Postsynaptic potential
☑ Correct Answer: B
☑ Explanation: The correct sequence is: an action potential arrives at the presynaptic
terminal, triggering the release of neurotransmitters into the synaptic cleft. These
neurotransmitters then bind to receptors on the postsynaptic membrane, generating a
postsynaptic potential.
4. Which hormone is primarily responsible for the reabsorption of water in the collecting duct
of the nephron?
A. Aldosterone
B. Antidiuretic hormone (ADH)
C. Atrial natriuretic peptide (ANP)
D. Renin
☑ Correct Answer: B
☑ Explanation: Antidiuretic hormone (ADH) increases the permeability of the collecting
, 4
duct to water, promoting its reabsorption and concentrating the urine. Aldosterone promotes
sodium reabsorption, ANP promotes sodium excretion, and renin is an enzyme involved in the
RAAS.
5. A patient has a deficiency in intrinsic factor. Which of the following deficiencies is most likely
to result?
A. Iron deficiency anemia
B. Folic acid deficiency
C. Vitamin B12 deficiency
D. Vitamin K deficiency
☑ Correct Answer: C
☑ Explanation: Intrinsic factor is produced by parietal cells in the stomach and is essential
for the absorption of vitamin B12 in the ileum. Without it, pernicious anemia (vitamin B12
deficiency) results.
