Question 1

Which of the following best describes the process of endochondral ossification?

Accepted Answer

Bone forms by replacing hyaline cartilage, beginning at a primary ossification center.

Question 2

During the growth in length of a long bone, which zone of the epiphyseal plate is responsible for rapid cell division and pushing the epiphysis away from the diaphysis?

Accepted Answer

Proliferation (growth) zone

Question 3

A 14-year-old male suffers a fracture at the epiphyseal plate of his femur. Which of the following is a likely consequence if the injury is not properly treated?

Accepted Answer

The bone may stop growing in length, resulting in a shorter limb.

Question 4

Which hormone is primarily responsible for stimulating epiphyseal plate activity during childhood?

Accepted Answer

Growth hormone

Question 5

Which of the following best explains why weight-bearing exercise is recommended for osteoporosis prevention?

Accepted Answer

It stimulates bone remodeling in response to mechanical stress, increasing bone density.

Question 6

Which of the following is the correct sequence of events in the repair of a bone fracture?

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 7

Which of the following statements about bone remodeling is TRUE?

Accepted Answer

Bone remodeling is regulated by both hormonal controls and mechanical stress.

Question 8

A patient presents with bowed legs and enlarged bone ends. Laboratory tests reveal low vitamin D levels. Which condition is most likely?

Accepted Answer

Rickets

Question 9

Which of the following best describes the role of parathyroid hormone (PTH) in calcium homeostasis?

Accepted Answer

PTH stimulates osteoclasts to resorb bone, raising blood calcium.

Question 10

Which of the following is a distinguishing feature of intramembranous ossification compared to endochondral ossification?

Accepted Answer

It forms bones directly from fibrous connective tissue membranes.

Question 11

A 70-year-old woman presents with a vertebral fracture after a minor fall. Her bone matrix appears normal, but bone mass is significantly reduced. Which condition does she most likely have?

Accepted Answer

Osteoporosis

Question 12

Which of the following best explains why bones are thickest where they are most likely to buckle, according to Wolff’s law?

Accepted Answer

Mechanical stress stimulates bone remodeling, increasing thickness where stress is greatest.

Question 13

Which of the following is NOT a risk factor for osteoporosis?

Accepted Answer

Diet rich in calcium and protein

Question 14

Which of the following best describes the calcification front during bone deposit?

Accepted Answer

The abrupt transition zone between osteoid seam and older mineralized bone

Question 15

A patient with hypercalcemia is given high pharmacological doses of calcitonin. What is the expected effect?

Accepted Answer

A temporary decrease in blood calcium levels

Question 16

Which of the following is TRUE regarding Paget’s disease?

Accepted Answer

It is characterized by excessive and haphazard bone deposit and resorption.

Question 17

Which of the following best describes the role of osteoclasts in bone remodeling?

Accepted Answer

They secrete lysosomal enzymes and protons to digest bone matrix.

Question 18

Which of the following is a direct result of the activity of alkaline phosphatase during bone deposit?

Accepted Answer

Increased local phosphate ion concentration, promoting hydroxyapatite formation

Question 19

Which of the following is the primary reason why bones of bedridden patients become featureless?

Accepted Answer

Lack of mechanical stress leads to reduced bone remodeling and atrophy.

Question 20

Which of the following equations best represents the relationship between calcium and phosphate ions in the formation of hydroxyapatite crystals during bone mineralization?

Accepted Answer

$$10	ext{Ca}^{2+} + 6	ext{PO}_4$$^{3-}$$ + 2	ext{OH}^- ightarrow 	ext{Ca}_{10}(	ext{PO}_4)_6(	ext{OH})_2$$

Bone Development, Growth, Remodeling, and Disorders: Study Notes for Anatomy & Physiology

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