Question 1

Which of the following best describes the primary function of the epiphyseal plate in a growing long bone?

Accepted Answer

It is the site of lengthwise bone growth due to rapid chondrocyte division.

Question 2

A patient presents with bowed legs and X-rays reveal poorly calcified bones. Which deficiency is most likely responsible for this condition?

Accepted Answer

Vitamin D deficiency

Question 3

Which of the following bone cells is primarily responsible for bone resorption during remodeling?

Accepted Answer

Osteoclast

Question 4

A drug designed to treat osteoporosis would most likely target which of the following mechanisms?

Accepted Answer

Inhibit osteoclast activity and enhance osteoblast activity

Question 5

Which of the following equations correctly represents the main inorganic component of bone matrix?

Accepted Answer

$$Ca_{10}(PO_4$)_6(OH)_2$$

Question 6

Which hormone is primarily responsible for increasing blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 7

A fracture where the bone is crushed, commonly seen in osteoporotic bones, is best described as:

Accepted Answer

Compression fracture

Question 8

Which of the following best explains why spongy bone is found at the ends of long bones?

Accepted Answer

It reduces the weight of the bone while providing strength to withstand forces from multiple directions.

Question 9

During endochondral ossification, which sequence of events is correct?

Accepted Answer

Chondrocytes divide, cartilage matrix calcifies, and osteoblasts replace cartilage with bone.

Question 10

Which of the following is a correct pairing of bone type and example?

Accepted Answer

Flat bone – sternum

Question 11

Which structure allows blood vessels and nerves to travel from the periosteum into the compact bone at right angles to the shaft?

Accepted Answer

Volkmann’s (perforating) canal

Question 12

A 65-year-old woman suffers a hip fracture after a minor fall. Her bone density is low and she is postmenopausal. Which physiological change most likely contributed to her condition?

Accepted Answer

Decreased estrogen leading to increased osteoclast activity

Question 13

Which of the following best describes the role of canaliculi in compact bone?

Accepted Answer

They connect osteocytes to the nutrient supply and waste removal.

Question 14

Which of the following is NOT a function of bone?

Accepted Answer

Initiation of muscle contraction

Question 15

A child presents with a fracture in which the bone bends and partially breaks. What is the most likely type of fracture?

Accepted Answer

Greenstick fracture

Question 16

Which of the following best explains why healthy bones are considered 'stressed' bones?

Accepted Answer

Physical forces stimulate bone remodeling, increasing bone strength.

Question 17

Which of the following best describes the composition of the organic portion of bone matrix?

Accepted Answer

Collagen fibers and ground substance

Question 18

Which of the following scenarios would most likely result in increased parathyroid hormone (PTH) secretion?

Accepted Answer

Decreased blood calcium levels

Question 19

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

Accepted Answer

Hematoma forms, fibrocartilage callus forms, bony callus forms, bone remodeling

Question 20

Which of the following best describes the difference between compact and spongy bone?

Accepted Answer

Compact bone is dense and forms the outer layer, while spongy bone contains trabeculae and is found inside bones.

The Skeletal System: Structure, Function, and Bone Physiology

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