WGU D312 Anatomy and Physiology I with Lab | Complete Lab
Worksheets Parts 1-3 (Sections 1-6) | Questions, Answers &
Explanations | 2026/2027 Updated | 100% Correct- Western
Governors University
This exam assesses mastery of foundational concepts in anatomical terminology, body organization, anatomical
position, directional terms, body cavities, planes, and homeostasis. Questions require synthesis, application, and
analysis at an advanced undergraduate level, consistent with WGU D312 lab worksheet competencies. It contains
145 multiple-choice questions, each with four distractors and a fully worked rationale that explains why the keyed
answer is correct. Content is organized into 12 focused sections: Introduction to Anatomy and Physiology and the
Language of Anatomy (body organization, anatomical position, directional terms, body cavities, planes, and
homeostasis), Chemistry of Life and Cell Biology (biomolecules, membrane transport, organelles, cell cycle, and
cellular respiration), Histology and the Integumentary System (epithelial, connective, muscle, and nervous tissues;
skin structure and function), Skeletal System and Articulations (bone tissue, axial and appendicular skeleton, joint
structure and movement), Muscular System (muscle tissue types, skeletal muscle anatomy, contraction physiology,
and major muscle groups), Nervous System and Special Senses (neuron physiology, CNS/PNS organization,
action potentials, and sensory organs), Endocrine System (glands, hormone mechanisms, and regulation of body
processes), Cardiovascular System: Blood, Heart, and Vessels (blood composition, cardiac anatomy and cycle,
circulation, and blood pressure), Lymphatic and Immune Systems (lymph flow, innate and adaptive immunity, and
defense mechanisms), Respiratory System (airway anatomy, gas exchange, ventilation, and respiratory
Section 1: Introduction to Anatomy and Physiology and the Language of Anatomy (body
organization, anatomical position, directional terms, body cavities, planes, and homeostasis)
(Questions 1-13)
1 A surgeon makes a midline incision through the umbilicus and into the
peritoneal cavity. Which serous membrane is incised first?
A) Parietal peritoneum
B) Visceral peritoneum
C) Parietal pleura
D) Visceral pericardium
Answer: A
Rationale: The parietal peritoneum lines the internal surface of the abdominal
wall and is the first serous layer encountered when entering the peritoneal
cavity from the anterior abdominal wall. Visceral peritoneum covers organs,
while pleura and pericardium are in thoracic cavities.
2 Which statement best explains why the anatomical position is essential for
precise directional terminology?
A) It eliminates ambiguity by standardizing body orientation regardless of
actual posture.
,B) It allows for the use of terms like 'up' and 'down' relative to gravity.
C) It defines the body as supine with palms facing posteriorly.
D) It is only relevant for the skeletal system, not for soft tissues.
Answer: A
Rationale: The anatomical position provides a universal reference frame
(standing erect, face forward, arms at sides with palms forward) so that
directional terms like anterior/posterior and medial/lateral have consistent
meaning. It does not use gravitational up/down, nor is it supine with palms
posterior.
3 A patient reports pain located in the epigastric region. Which
abdominopelvic quadrant and cavity subdivision best describes this location?
A) Right upper quadrant; abdominal cavity
B) Left upper quadrant; pelvic cavity
C) Left lower quadrant; abdominal cavity
D) Right lower quadrant; pelvic cavity
Answer: A
Rationale: The epigastric region is centrally located in the upper abdomen,
which falls primarily within the right upper quadrant (and left upper quadrant)
but is classically associated with the right upper quadrant in quadrant schemes;
it lies in the abdominal cavity, not the pelvic cavity. The other options
misplace the region or cavity.
4 Which feedback mechanism is illustrated when a rise in blood glucose
stimulates insulin release, which then lowers blood glucose?
A) Negative feedback
B) Positive feedback
C) Feed-forward control
D) Neutral feedback
Answer: A
Rationale: Negative feedback opposes the initial change: elevated glucose
triggers insulin, which reduces glucose, restoring homeostasis. Positive
feedback amplifies changes, and feed-forward anticipates changes; neutral
feedback is not a standard physiological term.
,5 A transverse plane through the mid-thigh would divide the body into which
portions?
A) Superior and inferior portions
B) Anterior and posterior portions
C) Left and right portions
D) Medial and lateral portions
Answer: A
Rationale: A transverse (horizontal) plane divides the body into superior
(upper) and inferior (lower) parts. Coronal planes divide anterior/posterior, and
sagittal planes divide left/right; medial/lateral are directional terms, not planes.
6 Which body cavity is directly continuous with the cranial cavity through the
foramen magnum?
A) Vertebral cavity
B) Thoracic cavity
C) Abdominal cavity
D) Pelvic cavity
Answer: A
Rationale: The cranial cavity and vertebral (spinal) cavity are continuous via the
foramen magnum, forming the dorsal body cavity. Thoracic, abdominal, and
pelvic cavities are in the ventral cavity and not directly continuous with the
cranial cavity.
7 In the anatomical position, the pollex is lateral to the index finger. Which
directional term best describes the index finger relative to the pollex?
A) Medial
B) Lateral
C) Proximal
D) Distal
Answer: A
Rationale: If the pollex (thumb) is lateral, the index finger lies closer to the
midline of the hand, so it is medial to the pollex. Proximal/distal refer to limb
attachment, not side-to-side relationships.
8 Which level of structural organization is first capable of independent living?
A) Organismal
, B) Cellular
C) Tissue
D) Organ
Answer: A
Rationale: The organismal level represents the complete living being, capable
of independent existence. Cells, tissues, and organs are components that cannot
survive independently in the same sense.
9 A homeostatic imbalance results in a sustained increase in body temperature.
Which component of a feedback loop is most directly failing?
A) Effector
B) Sensor
C) Control center
D) Afferent pathway
Answer: A
Rationale: If body temperature remains elevated, the effector (e.g., sweat
glands, blood vessels) is not producing sufficient cooling response. The sensor
and control center may be functioning, but the effector's response is
inadequate.
10 Which statement correctly distinguishes the dorsal from the ventral body
cavity?
A) Dorsal cavity includes cranial and vertebral cavities; ventral includes
thoracic and abdominopelvic cavities.
B) Dorsal cavity includes thoracic and abdominopelvic cavities; ventral
includes cranial and vertebral cavities.
C) Dorsal cavity is lined by peritoneum; ventral cavity is lined by meninges.
D) Dorsal cavity is anterior; ventral cavity is posterior.
Answer: A
Rationale: The dorsal cavity comprises the cranial and vertebral cavities, while
the ventral cavity includes the thoracic and abdominopelvic cavities. The other
options reverse the cavities or misassign their linings and positions.
11 A CT scan reveals a tumor in the epigastric region. Which serous
membrane layer directly lines the stomach?
A) Parietal peritoneum
Worksheets Parts 1-3 (Sections 1-6) | Questions, Answers &
Explanations | 2026/2027 Updated | 100% Correct- Western
Governors University
This exam assesses mastery of foundational concepts in anatomical terminology, body organization, anatomical
position, directional terms, body cavities, planes, and homeostasis. Questions require synthesis, application, and
analysis at an advanced undergraduate level, consistent with WGU D312 lab worksheet competencies. It contains
145 multiple-choice questions, each with four distractors and a fully worked rationale that explains why the keyed
answer is correct. Content is organized into 12 focused sections: Introduction to Anatomy and Physiology and the
Language of Anatomy (body organization, anatomical position, directional terms, body cavities, planes, and
homeostasis), Chemistry of Life and Cell Biology (biomolecules, membrane transport, organelles, cell cycle, and
cellular respiration), Histology and the Integumentary System (epithelial, connective, muscle, and nervous tissues;
skin structure and function), Skeletal System and Articulations (bone tissue, axial and appendicular skeleton, joint
structure and movement), Muscular System (muscle tissue types, skeletal muscle anatomy, contraction physiology,
and major muscle groups), Nervous System and Special Senses (neuron physiology, CNS/PNS organization,
action potentials, and sensory organs), Endocrine System (glands, hormone mechanisms, and regulation of body
processes), Cardiovascular System: Blood, Heart, and Vessels (blood composition, cardiac anatomy and cycle,
circulation, and blood pressure), Lymphatic and Immune Systems (lymph flow, innate and adaptive immunity, and
defense mechanisms), Respiratory System (airway anatomy, gas exchange, ventilation, and respiratory
Section 1: Introduction to Anatomy and Physiology and the Language of Anatomy (body
organization, anatomical position, directional terms, body cavities, planes, and homeostasis)
(Questions 1-13)
1 A surgeon makes a midline incision through the umbilicus and into the
peritoneal cavity. Which serous membrane is incised first?
A) Parietal peritoneum
B) Visceral peritoneum
C) Parietal pleura
D) Visceral pericardium
Answer: A
Rationale: The parietal peritoneum lines the internal surface of the abdominal
wall and is the first serous layer encountered when entering the peritoneal
cavity from the anterior abdominal wall. Visceral peritoneum covers organs,
while pleura and pericardium are in thoracic cavities.
2 Which statement best explains why the anatomical position is essential for
precise directional terminology?
A) It eliminates ambiguity by standardizing body orientation regardless of
actual posture.
,B) It allows for the use of terms like 'up' and 'down' relative to gravity.
C) It defines the body as supine with palms facing posteriorly.
D) It is only relevant for the skeletal system, not for soft tissues.
Answer: A
Rationale: The anatomical position provides a universal reference frame
(standing erect, face forward, arms at sides with palms forward) so that
directional terms like anterior/posterior and medial/lateral have consistent
meaning. It does not use gravitational up/down, nor is it supine with palms
posterior.
3 A patient reports pain located in the epigastric region. Which
abdominopelvic quadrant and cavity subdivision best describes this location?
A) Right upper quadrant; abdominal cavity
B) Left upper quadrant; pelvic cavity
C) Left lower quadrant; abdominal cavity
D) Right lower quadrant; pelvic cavity
Answer: A
Rationale: The epigastric region is centrally located in the upper abdomen,
which falls primarily within the right upper quadrant (and left upper quadrant)
but is classically associated with the right upper quadrant in quadrant schemes;
it lies in the abdominal cavity, not the pelvic cavity. The other options
misplace the region or cavity.
4 Which feedback mechanism is illustrated when a rise in blood glucose
stimulates insulin release, which then lowers blood glucose?
A) Negative feedback
B) Positive feedback
C) Feed-forward control
D) Neutral feedback
Answer: A
Rationale: Negative feedback opposes the initial change: elevated glucose
triggers insulin, which reduces glucose, restoring homeostasis. Positive
feedback amplifies changes, and feed-forward anticipates changes; neutral
feedback is not a standard physiological term.
,5 A transverse plane through the mid-thigh would divide the body into which
portions?
A) Superior and inferior portions
B) Anterior and posterior portions
C) Left and right portions
D) Medial and lateral portions
Answer: A
Rationale: A transverse (horizontal) plane divides the body into superior
(upper) and inferior (lower) parts. Coronal planes divide anterior/posterior, and
sagittal planes divide left/right; medial/lateral are directional terms, not planes.
6 Which body cavity is directly continuous with the cranial cavity through the
foramen magnum?
A) Vertebral cavity
B) Thoracic cavity
C) Abdominal cavity
D) Pelvic cavity
Answer: A
Rationale: The cranial cavity and vertebral (spinal) cavity are continuous via the
foramen magnum, forming the dorsal body cavity. Thoracic, abdominal, and
pelvic cavities are in the ventral cavity and not directly continuous with the
cranial cavity.
7 In the anatomical position, the pollex is lateral to the index finger. Which
directional term best describes the index finger relative to the pollex?
A) Medial
B) Lateral
C) Proximal
D) Distal
Answer: A
Rationale: If the pollex (thumb) is lateral, the index finger lies closer to the
midline of the hand, so it is medial to the pollex. Proximal/distal refer to limb
attachment, not side-to-side relationships.
8 Which level of structural organization is first capable of independent living?
A) Organismal
, B) Cellular
C) Tissue
D) Organ
Answer: A
Rationale: The organismal level represents the complete living being, capable
of independent existence. Cells, tissues, and organs are components that cannot
survive independently in the same sense.
9 A homeostatic imbalance results in a sustained increase in body temperature.
Which component of a feedback loop is most directly failing?
A) Effector
B) Sensor
C) Control center
D) Afferent pathway
Answer: A
Rationale: If body temperature remains elevated, the effector (e.g., sweat
glands, blood vessels) is not producing sufficient cooling response. The sensor
and control center may be functioning, but the effector's response is
inadequate.
10 Which statement correctly distinguishes the dorsal from the ventral body
cavity?
A) Dorsal cavity includes cranial and vertebral cavities; ventral includes
thoracic and abdominopelvic cavities.
B) Dorsal cavity includes thoracic and abdominopelvic cavities; ventral
includes cranial and vertebral cavities.
C) Dorsal cavity is lined by peritoneum; ventral cavity is lined by meninges.
D) Dorsal cavity is anterior; ventral cavity is posterior.
Answer: A
Rationale: The dorsal cavity comprises the cranial and vertebral cavities, while
the ventral cavity includes the thoracic and abdominopelvic cavities. The other
options reverse the cavities or misassign their linings and positions.
11 A CT scan reveals a tumor in the epigastric region. Which serous
membrane layer directly lines the stomach?
A) Parietal peritoneum
