WGU D115 OA ADVANCED
PATHOPHYSIOLOGY ACTUAL
EXAM WITH COMPLETE
QUESTIONS AND CORRECT
DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||2026/2027
Which of the following is required for osteoclast
activation?
A. RANKL
B. OPG
C. Calcitriol
D. PTH
Correct Answer: A. RANKL
Rationale:
Osteoclast activation is primarily regulated by
,RANKL (Receptor Activator of Nuclear Factor κB
Ligand), a cytokine that binds to its receptor RANK
on osteoclast precursors, stimulating their
differentiation into active osteoclasts.
Osteoprotegerin (OPG) is a decoy receptor for
RANKL and prevents osteoclastogenesis by
blocking RANKL from binding to RANK.
What leads to primary osteoporosis?
A. Genetic mutations
B. Dysregulation of the RANKL/OPG system
C. Chronic glucocorticoid therapy
D. Inactivity
Correct Answer: B. Dysregulation of the
RANKL/OPG system
,Rationale:
Primary osteoporosis typically results from an
imbalance between osteoclast and osteoblast
activity. The dysregulation of the RANKL/OPG
system, where RANKL is overexpressed or OPG is
underexpressed, leads to increased bone resorption
by osteoclasts and decreased bone formation,
contributing to bone density loss and osteoporosis.
What is the role of Type IX collagen in articular
cartilage?
A. It provides the elasticity to the cartilage
B. It binds collagen fibers to the bone
C. It serves as a scaffolding for type II collagen in
, articular cartilage
D. It regulates the synthesis of proteoglycans
Correct Answer: C. It serves as a scaffolding for
type II collagen in articular cartilage
Rationale:
Type IX collagen is a fibrillar collagen that plays a
crucial role in anchoring type II collagen fibers, the
primary structural component of articular cartilage,
into the cartilage matrix. This stabilizes the cartilage
structure, helping to maintain its integrity and
function.
What does an osteosarcoma typically present
with?
A. A sunburst pattern of bone destruction
PATHOPHYSIOLOGY ACTUAL
EXAM WITH COMPLETE
QUESTIONS AND CORRECT
DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||2026/2027
Which of the following is required for osteoclast
activation?
A. RANKL
B. OPG
C. Calcitriol
D. PTH
Correct Answer: A. RANKL
Rationale:
Osteoclast activation is primarily regulated by
,RANKL (Receptor Activator of Nuclear Factor κB
Ligand), a cytokine that binds to its receptor RANK
on osteoclast precursors, stimulating their
differentiation into active osteoclasts.
Osteoprotegerin (OPG) is a decoy receptor for
RANKL and prevents osteoclastogenesis by
blocking RANKL from binding to RANK.
What leads to primary osteoporosis?
A. Genetic mutations
B. Dysregulation of the RANKL/OPG system
C. Chronic glucocorticoid therapy
D. Inactivity
Correct Answer: B. Dysregulation of the
RANKL/OPG system
,Rationale:
Primary osteoporosis typically results from an
imbalance between osteoclast and osteoblast
activity. The dysregulation of the RANKL/OPG
system, where RANKL is overexpressed or OPG is
underexpressed, leads to increased bone resorption
by osteoclasts and decreased bone formation,
contributing to bone density loss and osteoporosis.
What is the role of Type IX collagen in articular
cartilage?
A. It provides the elasticity to the cartilage
B. It binds collagen fibers to the bone
C. It serves as a scaffolding for type II collagen in
, articular cartilage
D. It regulates the synthesis of proteoglycans
Correct Answer: C. It serves as a scaffolding for
type II collagen in articular cartilage
Rationale:
Type IX collagen is a fibrillar collagen that plays a
crucial role in anchoring type II collagen fibers, the
primary structural component of articular cartilage,
into the cartilage matrix. This stabilizes the cartilage
structure, helping to maintain its integrity and
function.
What does an osteosarcoma typically present
with?
A. A sunburst pattern of bone destruction
