DEXA Anatomy & Physiology of Bone Structure 3

Question 1

Peak bone mass in humans is typically achieved at approximately what age?

Accepted Answer

Age 25–30

Answer

Peak bone mass is generally reached between ages 25 and 30, after which bone density gradually declines.

Question 2

Which vertebral region is most commonly evaluated by DEXA for osteoporosis screening in the axial skeleton?

Accepted Answer

Lumbar (L1–L4)

Answer

The lumbar spine (L1–L4) is the standard axial site evaluated by DEXA because it contains predominantly trabecular bone sensitive to metabolic changes.

Question 3

Endochondral ossification is the process by which:

Accepted Answer

Long bones develop by replacing a cartilage template with bone

Answer

Endochondral ossification is the developmental process in which a hyaline cartilage model is gradually replaced by mineralized bone to form long bones.

Question 4

The epiphyseal growth plate (physis) is composed primarily of which tissue?

Accepted Answer

Hyaline cartilage

Answer

The growth plate is made of hyaline cartilage and is responsible for longitudinal bone growth in children until it ossifies at skeletal maturity.

Question 5

Which of the following best defines 'bone mineral density' (BMD) as measured by DEXA?

Accepted Answer

Bone mineral content divided by the projected scan area (g/cm²)

Answer

DEXA-derived BMD is calculated as bone mineral content (grams) divided by the two-dimensional projected scan area (cm²), yielding an areal density in g/cm².

(DEXA) DEXA Bone Density Scan Certification Practice Test

(DEXA) DEXA Bone Density Scan Certification Practice Test

DEXA Anatomy & Physiology of Bone Structure 3