WGU D312 Anatomy & Physiology:
Comprehensive Practice Questions
with Detailed Rationales (Complete
Exam Review)
Section 1: Anatomical Terminology & Body Organization (Questions 1-
15)
1. Which plane divides the body into superior (top) and inferior
(bottom) sections?
Answer: Transverse plane
Rationale: The transverse (or horizontal) plane runs parallel to the
ground, dividing the body into top and bottom portions. This is
commonly used in CT scans and MRIs.
2. Which directional term means "toward the head"?
Answer: Cephalic
Rationale: Cephalic means toward the head or superior part of the
body. For example, the cephalic region includes the head. The term is
derived from the Greek word "kephale," meaning head.
3. What does the term "proximal" mean?
Answer: Closer to the trunk or point of origin
, Rationale: Proximal describes a structure that is closer to the trunk of
the body or the point of attachment. For example, the elbow is
proximal to the wrist.
4. The maintenance of a stable internal environment despite external
changes is called:
Answer: Homeostasis
Rationale: Homeostasis is the dynamic process by which the body
maintains stable internal conditions like temperature, pH, and blood
glucose within narrow, optimal ranges.
5. What is the role of an effector in a negative feedback system?
Answer: To carry out the response that reverses the initial deviation
Rationale: In a negative feedback loop, the effector is the structure
(muscle or gland) that responds to commands from the control center
to counteract the initial stimulus and return the variable to its set
point.
6. Which of the following is an example of a negative feedback loop?
Answer: Regulation of blood glucose by insulin and glucagon
Rationale: This is a classic example of negative feedback. When blood
glucose rises, insulin is released to lower it; when glucose drops,
glucagon is released to raise it. This reverses the initial change.
7. Which cavity contains the brain?
Answer: Cranial cavity
Rationale: The cranial cavity, part of the dorsal body cavity, is
enclosed by the skull and houses the brain.
8. The dorsal body cavity contains which two major structures?
, Answer: The brain and spinal cord
Rationale: The dorsal cavity is subdivided into the cranial cavity
(housing the brain) and the vertebral cavity (housing the spinal cord).
This location protects the central nervous system.
9. What does the coronal plane divide the body into?
Answer: Anterior (front) and posterior (back) sections
Rationale: The coronal (or frontal) plane runs vertically from side to
side, dividing the body into front and back sections.
10. The term "medial" means:
Answer: Toward the midline of the body
Rationale: Medial indicates a position closer to the body's sagittal
midline. For example, the nose is medial to the eyes.
11. What is the smallest independently functioning biological unit of
an organism?
Answer: Cell
Rationale: The cell is the basic structural and functional unit of all
living things, capable of performing all life processes independently.
12. Which level of structural organization consists of similar cells that
perform a common function?
Answer: Tissue level
Rationale: Tissues are groups of similar cells that work together to
perform a specific function. The four main types are epithelial,
connective, muscle, and nervous tissue.
13. What is a collection of similar tissues that performs a specific
function?
, Answer: Organ
Rationale: An organ is a structure composed of two or more tissue
types that work together to perform a specific function, such as the
heart or liver.
14. A patient has a surgical incision made along the midline of the
anterior abdominal wall. Which directional term describes this
location?
Answer: Medial
Rationale: A midline incision is medial because it lies on the body's
sagittal midline, equidistant from the left and right sides of the body.
15. Which body system is responsible for structural support?
Answer: Skeletal system
Rationale: The skeletal system provides structural support, protection
for internal organs, and a framework for movement.
Section 2: Cell Biology and Histology (Questions 16-35)
16. The cell membrane is composed primarily of what molecules?
Answer: Phospholipids
Rationale: The plasma membrane is fundamentally a phospholipid
bilayer. Phospholipids have hydrophilic heads and hydrophobic tails,
creating a semipermeable barrier that controls what enters and exits
the cell.
17. Which organelle is responsible for ATP production through aerobic
respiration?
Answer: Mitochondrion
Comprehensive Practice Questions
with Detailed Rationales (Complete
Exam Review)
Section 1: Anatomical Terminology & Body Organization (Questions 1-
15)
1. Which plane divides the body into superior (top) and inferior
(bottom) sections?
Answer: Transverse plane
Rationale: The transverse (or horizontal) plane runs parallel to the
ground, dividing the body into top and bottom portions. This is
commonly used in CT scans and MRIs.
2. Which directional term means "toward the head"?
Answer: Cephalic
Rationale: Cephalic means toward the head or superior part of the
body. For example, the cephalic region includes the head. The term is
derived from the Greek word "kephale," meaning head.
3. What does the term "proximal" mean?
Answer: Closer to the trunk or point of origin
, Rationale: Proximal describes a structure that is closer to the trunk of
the body or the point of attachment. For example, the elbow is
proximal to the wrist.
4. The maintenance of a stable internal environment despite external
changes is called:
Answer: Homeostasis
Rationale: Homeostasis is the dynamic process by which the body
maintains stable internal conditions like temperature, pH, and blood
glucose within narrow, optimal ranges.
5. What is the role of an effector in a negative feedback system?
Answer: To carry out the response that reverses the initial deviation
Rationale: In a negative feedback loop, the effector is the structure
(muscle or gland) that responds to commands from the control center
to counteract the initial stimulus and return the variable to its set
point.
6. Which of the following is an example of a negative feedback loop?
Answer: Regulation of blood glucose by insulin and glucagon
Rationale: This is a classic example of negative feedback. When blood
glucose rises, insulin is released to lower it; when glucose drops,
glucagon is released to raise it. This reverses the initial change.
7. Which cavity contains the brain?
Answer: Cranial cavity
Rationale: The cranial cavity, part of the dorsal body cavity, is
enclosed by the skull and houses the brain.
8. The dorsal body cavity contains which two major structures?
, Answer: The brain and spinal cord
Rationale: The dorsal cavity is subdivided into the cranial cavity
(housing the brain) and the vertebral cavity (housing the spinal cord).
This location protects the central nervous system.
9. What does the coronal plane divide the body into?
Answer: Anterior (front) and posterior (back) sections
Rationale: The coronal (or frontal) plane runs vertically from side to
side, dividing the body into front and back sections.
10. The term "medial" means:
Answer: Toward the midline of the body
Rationale: Medial indicates a position closer to the body's sagittal
midline. For example, the nose is medial to the eyes.
11. What is the smallest independently functioning biological unit of
an organism?
Answer: Cell
Rationale: The cell is the basic structural and functional unit of all
living things, capable of performing all life processes independently.
12. Which level of structural organization consists of similar cells that
perform a common function?
Answer: Tissue level
Rationale: Tissues are groups of similar cells that work together to
perform a specific function. The four main types are epithelial,
connective, muscle, and nervous tissue.
13. What is a collection of similar tissues that performs a specific
function?
, Answer: Organ
Rationale: An organ is a structure composed of two or more tissue
types that work together to perform a specific function, such as the
heart or liver.
14. A patient has a surgical incision made along the midline of the
anterior abdominal wall. Which directional term describes this
location?
Answer: Medial
Rationale: A midline incision is medial because it lies on the body's
sagittal midline, equidistant from the left and right sides of the body.
15. Which body system is responsible for structural support?
Answer: Skeletal system
Rationale: The skeletal system provides structural support, protection
for internal organs, and a framework for movement.
Section 2: Cell Biology and Histology (Questions 16-35)
16. The cell membrane is composed primarily of what molecules?
Answer: Phospholipids
Rationale: The plasma membrane is fundamentally a phospholipid
bilayer. Phospholipids have hydrophilic heads and hydrophobic tails,
creating a semipermeable barrier that controls what enters and exits
the cell.
17. Which organelle is responsible for ATP production through aerobic
respiration?
Answer: Mitochondrion
