Question 1

Which of the following is NOT a function of the skeletal system?

Accepted Answer

Regulation of body temperature

Question 2

A patient presents with a bone fracture that does not break through the skin and is only visible on an X-ray. What type of fracture is this?

Accepted Answer

Closed (simple) fracture

Question 3

Which bone cell type is primarily responsible for breaking down bone matrix and releasing minerals into the bloodstream?

Accepted Answer

Osteoclasts

Question 4

During endochondral ossification, what is the correct sequence of events?

Accepted Answer

Chondrocytes enlarge and die, bone formation starts at shaft surface, blood vessels invade, spongy bone forms in center

Question 5

Which vitamin is essential for calcium absorption in the intestines, and what is its active form?

Accepted Answer

Vitamin D; calcitriol

Question 6

A 65-year-old woman is diagnosed with osteoporosis. Which of the following best explains why this condition is more common in postmenopausal women?

Accepted Answer

Decreased estrogen levels accelerate bone loss

Question 7

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

Accepted Answer

Compact bone is relatively solid and forms the wall of the diaphysis, while spongy bone consists of trabeculae and fills the epiphyses

Question 8

Which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 9

A child with a vitamin D deficiency is likely to develop which condition, and what is the primary symptom?

Accepted Answer

Rickets; soft, deformed bones

Question 10

Which of the following best explains why bones subjected to regular exercise become thicker and stronger?

Accepted Answer

Exercise stimulates osteoblasts to deposit more bone matrix, increasing bone mass

Question 11

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

Accepted Answer

Flat bone – rib

Question 12

A patient has a fracture at the epiphyseal plate of the femur. What is the most likely consequence if not properly treated?

Accepted Answer

Impaired bone lengthening during growth

Question 13

Which of the following best describes appositional growth in bones?

Accepted Answer

Increase in bone diameter by adding new bone matrix to the outer surface

Question 14

Which of the following structures is responsible for isolating bone from surrounding tissues and providing a route for blood vessels and nerves?

Accepted Answer

Periosteum

Question 15

A 30-year-old male has been on crutches for 6 months due to a leg injury. What is the most likely effect on the bones of his immobilized leg?

Accepted Answer

Decreased bone mass and increased brittleness

Question 16

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

Accepted Answer

$$Ca_3$$($$PO_4)_2$ (calcium phosphate)

Question 17

Which of the following best describes the role of red bone marrow?

Accepted Answer

Site of red and white blood cell production

Question 18

Which of the following joints allows for the greatest range of motion but is also the most frequently dislocated?

Accepted Answer

Ball-and-socket joint

Question 19

A patient is unable to absorb enough calcium from their diet due to a lack of sunlight exposure. Which process is most directly impaired?

Accepted Answer

Synthesis of vitamin D in the skin

Question 20

Which of the following best explains why the parallel arrangement of osteons in compact bone is important?

Accepted Answer

It resists stress in a specific direction, especially along the length of the bone

The Skeletal System: Structure, Function, and Organization

Study Guide - Practice Questions