BONE DENSITY REGISTRY EXAM NEWEST 2026 ACTUAL
EXAM TEST BANK| COMPLETE 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| BONE DENSITY REGISTRY
EXAM PREP 2026/2027 (MOST RECENT!!)
1. Which vertebral level is most commonly fractured in
osteoporotic patients?
• A) T5–T7
• B) L3–L5
• C) T12–L1
• D) C5–C7
Rationale: The thoracolumbar junction (T12–L1) experiences the
greatest biomechanical stress and is the most common site of
osteoporotic vertebral compression fractures.
1
,2. The cortical bone of the proximal femur is thickest at which
region?
• A) Greater trochanter
• B) Femoral neck
• C) Shaft
• D) Lesser trochanter
Rationale: Cortical bone thickness decreases from the shaft to
the femoral neck. The neck is mostly trabecular bone, making it
more vulnerable to osteoporotic fracture.
3. Which skeletal site has the highest percentage of trabecular
bone?
• A) Lumbar spine (vertebral body)
• B) Mid-shaft radius
• C) Femoral neck
2
, • D) Calcaneus
Rationale: Vertebral bodies are ~75% trabecular bone, which
has higher metabolic activity and shows early bone loss. The
femoral neck is ~50% trabecular, 50% cortical.
4. Osteoblasts are derived from which precursor cells?
• A) Mesenchymal stem cells
• B) Hematopoietic stem cells
• C) Osteoclasts
• D) Chondrocytes
Rationale: Osteoblasts differentiate from mesenchymal stem
cells; osteoclasts come from hematopoietic lineage
(monocyte/macrophage).
5. The RANK/RANKL/OPG system primarily regulates:
• A) Osteoblast differentiation
3
, • B) Osteoclast activity
mn mn
• C) Collagen synthesis
mn mn
• D) Calcium absorption
mn mn
Rationale: RANKL (on osteoblasts) binds RANK on osteoclast
mn mn mn mn mn mn mn
mn precursors → stimulates osteoclastogenesis. OPG is a decoy
mn mn mn mn mn mn mn
mn receptor that inhibits this pathway.
mn mn mn mn
6. Which hormone decreases bone resorption?
mn mn mn mn
• A) Parathyroid hormone (PTH)
mn mn mn
• B) Calcitonin
mn
• C) Cortisol
mn
• D) Thyroid hormone
mn mn
Rationale: Calcitonin inhibits osteoclast activity. PTH increases
mn mn mn mn mn mn
mn resorption (at high sustained levels). Cortisol and thyroid hormone
mn mn mn mn mn mn mn mn
mn promote bone loss.
mn mn
4
EXAM TEST BANK| COMPLETE 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| BONE DENSITY REGISTRY
EXAM PREP 2026/2027 (MOST RECENT!!)
1. Which vertebral level is most commonly fractured in
osteoporotic patients?
• A) T5–T7
• B) L3–L5
• C) T12–L1
• D) C5–C7
Rationale: The thoracolumbar junction (T12–L1) experiences the
greatest biomechanical stress and is the most common site of
osteoporotic vertebral compression fractures.
1
,2. The cortical bone of the proximal femur is thickest at which
region?
• A) Greater trochanter
• B) Femoral neck
• C) Shaft
• D) Lesser trochanter
Rationale: Cortical bone thickness decreases from the shaft to
the femoral neck. The neck is mostly trabecular bone, making it
more vulnerable to osteoporotic fracture.
3. Which skeletal site has the highest percentage of trabecular
bone?
• A) Lumbar spine (vertebral body)
• B) Mid-shaft radius
• C) Femoral neck
2
, • D) Calcaneus
Rationale: Vertebral bodies are ~75% trabecular bone, which
has higher metabolic activity and shows early bone loss. The
femoral neck is ~50% trabecular, 50% cortical.
4. Osteoblasts are derived from which precursor cells?
• A) Mesenchymal stem cells
• B) Hematopoietic stem cells
• C) Osteoclasts
• D) Chondrocytes
Rationale: Osteoblasts differentiate from mesenchymal stem
cells; osteoclasts come from hematopoietic lineage
(monocyte/macrophage).
5. The RANK/RANKL/OPG system primarily regulates:
• A) Osteoblast differentiation
3
, • B) Osteoclast activity
mn mn
• C) Collagen synthesis
mn mn
• D) Calcium absorption
mn mn
Rationale: RANKL (on osteoblasts) binds RANK on osteoclast
mn mn mn mn mn mn mn
mn precursors → stimulates osteoclastogenesis. OPG is a decoy
mn mn mn mn mn mn mn
mn receptor that inhibits this pathway.
mn mn mn mn
6. Which hormone decreases bone resorption?
mn mn mn mn
• A) Parathyroid hormone (PTH)
mn mn mn
• B) Calcitonin
mn
• C) Cortisol
mn
• D) Thyroid hormone
mn mn
Rationale: Calcitonin inhibits osteoclast activity. PTH increases
mn mn mn mn mn mn
mn resorption (at high sustained levels). Cortisol and thyroid hormone
mn mn mn mn mn mn mn mn
mn promote bone loss.
mn mn
4
