Question 1

Which of the following statements best distinguishes primary (woven) bone from secondary (lamellar) bone?

Accepted Answer

Primary bone has an irregular arrangement of collagen fibers and is later replaced by secondary bone.

Question 2

During intramembranous ossification, which of the following sequences correctly describes the process?

Accepted Answer

Mesenchymal cells condense, differentiate into osteogenic cells, become osteoblasts, and secrete collagen in primary ossification centers.

Question 3

Which bones are primarily formed through intramembranous ossification?

Accepted Answer

Flat bones of the skull and clavicle

Question 4

Endochondral ossification begins with which starting material?

Accepted Answer

A model of hyaline cartilage

Question 5

A child with a genetic defect preventing the formation of hyaline cartilage would most likely have impaired development of which bones?

Accepted Answer

Long bones such as the femur and humerus

Question 6

Which of the following best describes the difference between longitudinal and appositional bone growth?

Accepted Answer

Longitudinal growth increases bone length via chondrocyte division at the epiphyseal plate, while appositional growth increases bone width via osteoblast activity under the periosteum.

Question 7

Which hormone is most responsible for accelerating the closure of the epiphyseal plate during puberty?

Accepted Answer

Estrogen

Question 8

A 14-year-old male is experiencing rapid increases in bone width but not length. Which hormone is most likely elevated?

Accepted Answer

Testosterone

Question 9

Which of the following is a direct result of osteoclast activity during bone remodeling?

Accepted Answer

Release of calcium ions ($\mathrm{Ca^{2+}}$) into the bloodstream

Question 10

A postmenopausal woman is at increased risk for osteoporosis primarily due to a decrease in which hormone?

Accepted Answer

Estrogen

Question 11

Which of the following best explains why primary (woven) bone is replaced by secondary (lamellar) bone during development?

Accepted Answer

Secondary bone has a regular arrangement of collagen fibers and a higher percentage of inorganic matrix, making it stronger.

Question 12

During endochondral ossification, what is the role of the bone collar?

Accepted Answer

It stabilizes the cartilage model and initiates the formation of the primary ossification center.

Question 13

Which of the following best describes the process occurring at the epiphyseal plate during longitudinal bone growth?

Accepted Answer

Chondrocytes divide and enlarge, cartilage is calcified, and osteoblasts deposit bone tissue.

Question 14

A patient with a tumor secreting excess growth hormone after epiphyseal plate closure would most likely develop which condition?

Accepted Answer

Acromegaly

Question 15

Which of the following is NOT a function of bone remodeling?

Accepted Answer

Replacing secondary bone with primary bone

Question 16

A 10-year-old child fractures his femur. Which type of bone will be formed first during the repair process?

Accepted Answer

Primary (woven) bone

Question 17

Which of the following best describes the effect of testosterone on bone growth during adolescence?

Accepted Answer

It increases the rate of longitudinal growth and stimulates appositional growth.

Question 18

Which of the following is a real-world consequence of decreased bone density due to osteoporosis?

Accepted Answer

Increased risk of fractures and slower healing rates

Question 19

Which of the following best explains why estrogen replacement therapy can help prevent osteoporosis in postmenopausal women?

Accepted Answer

Estrogen stimulates osteoblast activity and slows bone resorption.

Question 20

A patient with a mutation that prevents osteoblasts from secreting collagen would most likely have which of the following problems?

Accepted Answer

Defective bone matrix formation and weak bones

Bone Development and Growth: Ossification, Bone Types, and Hormonal Regulation

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