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WGU D312 Anatomy and Physiology I
Objective Assessment Exam 2025/2026 –
Questions with Correct Detailed Answers
and Rationales
Question 1
What is the term for information detected by a receptor and sent back to the control center based
on the response?
A. Stimulus
B. Effector
C. Feedback
D. Homeostasis
Correct Answer: C. Feedback
Rationale: Feedback refers to the information detected by receptors and relayed to the
control center to assess the response to a stimulus, enabling adjustments to maintain homeostasis.
Question 2
What type of feedback system repeats until the controlled condition is brought back to normal?
A. Negative feedback
B. Positive feedback
C. Neutral feedback
D. Dynamic feedback
Correct Answer: A. Negative feedback
Rationale: Negative feedback systems counteract changes to restore a controlled condition
to its set point, such as regulating body temperature or blood glucose levels.
Question 3
Which plane divides the body into top and bottom sections?
A. Sagittal plane
B. Coronal plane
, 2
C. Transverse plane
D. Midsagittal plane
Correct Answer: C. Transverse plane
Rationale: The transverse (horizontal) plane divides the body into superior (top) and inferior
(bottom) sections.
Question 4
Which plane divides the body into front and back sections?
A. Sagittal plane
B. Coronal plane
C. Transverse plane
D. Oblique plane
Correct Answer: B. Coronal plane
Rationale: The coronal (frontal) plane divides the body into anterior (front) and posterior
(back) sections.
Question 5
Which plane divides the body into left and right sections?
A. Coronal plane
B. Transverse plane
C. Sagittal plane
D. Frontal plane
Correct Answer: C. Sagittal plane
Rationale: The sagittal plane divides the body into left and right sections, with the
midsagittal plane creating equal halves.
Question 6
What does the term "cephalic" refer to?
A. Toward the feet
B. Toward the head
C. Toward the back
D. Toward the midline
, 3
Correct Answer: B. Toward the head
Rationale: Cephalic means toward the head or superior part of the body, often used in
anatomical terminology.
Question 7
Which body system is responsible for structural support?
A. Muscular system
B. Skeletal system
C. Nervous system
D. Endocrine system
Correct Answer: B. Skeletal system
Rationale: The skeletal system provides structural support, protection, and a framework for
movement.
Question 8
What is the smallest independently functioning biological unit of an organism?
A. Tissue
B. Organ
C. Cell
D. System
Correct Answer: C. Cell
Rationale: The cell is the smallest unit capable of performing all life functions
independently, forming the basis of biological organization.
Question 9
What is a collection of similar tissues that performs a specific function?
A. Cell
B. Organ
C. System
D. Organism
Correct Answer: B. Organ
Rationale: An organ is a group of similar tissues working together to perform a specific
function, such as the heart or liver.
WGU D312 Anatomy and Physiology I
Objective Assessment Exam 2025/2026 –
Questions with Correct Detailed Answers
and Rationales
Question 1
What is the term for information detected by a receptor and sent back to the control center based
on the response?
A. Stimulus
B. Effector
C. Feedback
D. Homeostasis
Correct Answer: C. Feedback
Rationale: Feedback refers to the information detected by receptors and relayed to the
control center to assess the response to a stimulus, enabling adjustments to maintain homeostasis.
Question 2
What type of feedback system repeats until the controlled condition is brought back to normal?
A. Negative feedback
B. Positive feedback
C. Neutral feedback
D. Dynamic feedback
Correct Answer: A. Negative feedback
Rationale: Negative feedback systems counteract changes to restore a controlled condition
to its set point, such as regulating body temperature or blood glucose levels.
Question 3
Which plane divides the body into top and bottom sections?
A. Sagittal plane
B. Coronal plane
, 2
C. Transverse plane
D. Midsagittal plane
Correct Answer: C. Transverse plane
Rationale: The transverse (horizontal) plane divides the body into superior (top) and inferior
(bottom) sections.
Question 4
Which plane divides the body into front and back sections?
A. Sagittal plane
B. Coronal plane
C. Transverse plane
D. Oblique plane
Correct Answer: B. Coronal plane
Rationale: The coronal (frontal) plane divides the body into anterior (front) and posterior
(back) sections.
Question 5
Which plane divides the body into left and right sections?
A. Coronal plane
B. Transverse plane
C. Sagittal plane
D. Frontal plane
Correct Answer: C. Sagittal plane
Rationale: The sagittal plane divides the body into left and right sections, with the
midsagittal plane creating equal halves.
Question 6
What does the term "cephalic" refer to?
A. Toward the feet
B. Toward the head
C. Toward the back
D. Toward the midline
, 3
Correct Answer: B. Toward the head
Rationale: Cephalic means toward the head or superior part of the body, often used in
anatomical terminology.
Question 7
Which body system is responsible for structural support?
A. Muscular system
B. Skeletal system
C. Nervous system
D. Endocrine system
Correct Answer: B. Skeletal system
Rationale: The skeletal system provides structural support, protection, and a framework for
movement.
Question 8
What is the smallest independently functioning biological unit of an organism?
A. Tissue
B. Organ
C. Cell
D. System
Correct Answer: C. Cell
Rationale: The cell is the smallest unit capable of performing all life functions
independently, forming the basis of biological organization.
Question 9
What is a collection of similar tissues that performs a specific function?
A. Cell
B. Organ
C. System
D. Organism
Correct Answer: B. Organ
Rationale: An organ is a group of similar tissues working together to perform a specific
function, such as the heart or liver.
