WGU D312 Anatomy and Physiology I
OA Exam 2025/2026 – 70 Questions with
Correct Verified Answers
Question 1
Which tissue type forms the lining of the stomach?
A) Connective
B) Epithelial
C) Muscle
D) Nervous
Rationale: Epithelial tissue lines body cavities and organs, such as the stomach, providing a
protective barrier and facilitating secretion and absorption, per WGU D312 standards.
Question 2
What is the primary function of the integumentary system?
A) Movement
B) Protection and temperature regulation
C) Nutrient absorption
D) Gas exchange
Rationale: The integumentary system (skin) protects against pathogens, regulates body
temperature, and prevents water loss, aligning with 2025 A&P curriculum.
Question 3
Which bone is part of the axial skeleton?
A) Femur
B) Sternum
C) Humerus
D) Scapula
Rationale: The sternum is part of the axial skeleton (skull, vertebrae, rib cage), supporting the
trunk, per WGU D312 skeletal system content.
Question 4
What is the structural unit of compact bone?
A) Sarcomere
,B) Osteon
C) Myofibril
D) Synapse
Rationale: The osteon, or Haversian system, is the cylindrical unit of compact bone containing
lamellae and osteocytes, per 2025 bone histology standards.
Question 5
Which organelle is the site of protein synthesis?
A) Mitochondrion
B) Ribosome
C) Golgi apparatus
D) Lysosome
Rationale: Ribosomes synthesize proteins by translating mRNA, a key cellular process in WGU
D312 cell biology.
Question 6
What is the role of the sarcoplasmic reticulum in muscle cells?
A) Protein synthesis
B) Calcium storage and release
C) Energy production
D) Waste removal
Rationale: The sarcoplasmic reticulum stores and releases calcium ions to trigger muscle
contraction, per 2025 muscle physiology.
Question 7
Which plane divides the body into superior and inferior parts?
A) Sagittal
B) Transverse
C) Frontal
D) Oblique
Rationale: The transverse plane cuts horizontally, separating upper and lower body, per WGU
D312 anatomical terminology.
Question 8
What type of joint is the elbow?
A) Ball-and-socket
, B) Hinge
C) Pivot
D) Saddle
Rationale: The elbow allows flexion and extension in one plane, characteristic of a hinge joint,
per 2025 joint classification.
Question 9
Which muscle is responsible for flexing the forearm?
A) Triceps brachii
B) Biceps brachii
C) Deltoid
D) Pectoralis major
Rationale: The biceps brachii contracts to flex the elbow, a key upper limb muscle in WGU
D312.
Question 10
What is the primary source of energy for cells?
A) Glucose
B) ATP
C) Lipids
D) Amino acids
Rationale: ATP provides immediate energy for cellular processes, per 2025 cellular metabolism
standards.
Question 11
Which tissue type contains adipocytes?
A) Nervous
B) Connective
C) Epithelial
D) Muscle
Rationale: Adipocytes (fat cells) are found in adipose tissue, a type of connective tissue, per
WGU D312 tissue histology.
Question 12
The cranium is part of which skeleton?
A) Appendicular
OA Exam 2025/2026 – 70 Questions with
Correct Verified Answers
Question 1
Which tissue type forms the lining of the stomach?
A) Connective
B) Epithelial
C) Muscle
D) Nervous
Rationale: Epithelial tissue lines body cavities and organs, such as the stomach, providing a
protective barrier and facilitating secretion and absorption, per WGU D312 standards.
Question 2
What is the primary function of the integumentary system?
A) Movement
B) Protection and temperature regulation
C) Nutrient absorption
D) Gas exchange
Rationale: The integumentary system (skin) protects against pathogens, regulates body
temperature, and prevents water loss, aligning with 2025 A&P curriculum.
Question 3
Which bone is part of the axial skeleton?
A) Femur
B) Sternum
C) Humerus
D) Scapula
Rationale: The sternum is part of the axial skeleton (skull, vertebrae, rib cage), supporting the
trunk, per WGU D312 skeletal system content.
Question 4
What is the structural unit of compact bone?
A) Sarcomere
,B) Osteon
C) Myofibril
D) Synapse
Rationale: The osteon, or Haversian system, is the cylindrical unit of compact bone containing
lamellae and osteocytes, per 2025 bone histology standards.
Question 5
Which organelle is the site of protein synthesis?
A) Mitochondrion
B) Ribosome
C) Golgi apparatus
D) Lysosome
Rationale: Ribosomes synthesize proteins by translating mRNA, a key cellular process in WGU
D312 cell biology.
Question 6
What is the role of the sarcoplasmic reticulum in muscle cells?
A) Protein synthesis
B) Calcium storage and release
C) Energy production
D) Waste removal
Rationale: The sarcoplasmic reticulum stores and releases calcium ions to trigger muscle
contraction, per 2025 muscle physiology.
Question 7
Which plane divides the body into superior and inferior parts?
A) Sagittal
B) Transverse
C) Frontal
D) Oblique
Rationale: The transverse plane cuts horizontally, separating upper and lower body, per WGU
D312 anatomical terminology.
Question 8
What type of joint is the elbow?
A) Ball-and-socket
, B) Hinge
C) Pivot
D) Saddle
Rationale: The elbow allows flexion and extension in one plane, characteristic of a hinge joint,
per 2025 joint classification.
Question 9
Which muscle is responsible for flexing the forearm?
A) Triceps brachii
B) Biceps brachii
C) Deltoid
D) Pectoralis major
Rationale: The biceps brachii contracts to flex the elbow, a key upper limb muscle in WGU
D312.
Question 10
What is the primary source of energy for cells?
A) Glucose
B) ATP
C) Lipids
D) Amino acids
Rationale: ATP provides immediate energy for cellular processes, per 2025 cellular metabolism
standards.
Question 11
Which tissue type contains adipocytes?
A) Nervous
B) Connective
C) Epithelial
D) Muscle
Rationale: Adipocytes (fat cells) are found in adipose tissue, a type of connective tissue, per
WGU D312 tissue histology.
Question 12
The cranium is part of which skeleton?
A) Appendicular
