Question 1

Which of the following best describes the main function of osteoclasts in bone tissue?

Accepted Answer

They break down bone matrix, releasing calcium and phosphate into the blood.

Question 2

A patient presents with a fracture in the diaphysis of the femur. Which structural component of the long bone is primarily affected?

Accepted Answer

Medullary cavity

Question 3

Which of the following equations correctly represents the relationship between bone mass, bone formation, and bone resorption?

Accepted Answer

$$Bone\ mass = Bone\ formation - Bone\ resorption$$

Question 4

During endochondral ossification, which of the following events occurs first?

Accepted Answer

Development of a cartilage model by chondroblasts

Question 5

A 12-year-old child is experiencing rapid growth in height. Which region of the long bone is primarily responsible for this growth?

Accepted Answer

Epiphyseal plate

Question 6

Which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 7

A patient with osteoporosis is prescribed a medication that inhibits osteoclasts. What is the expected effect on bone remodeling?

Accepted Answer

Decreased bone resorption and increased bone mass

Question 8

Which of the following best describes the difference between primary (woven) bone and secondary (lamellar) bone?

Accepted Answer

Primary bone is formed rapidly and is less organized, while secondary bone is formed slowly and is highly organized.

Question 9

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

Accepted Answer

Regulation of body temperature

Question 10

A patient has a herniated disc between the L4 and L5 vertebrae. Which region of the vertebral column is affected?

Accepted Answer

Lumbar

Question 11

Which of the following best describes a synovial joint?

Accepted Answer

A joint with a fluid-filled cavity allowing free movement

Question 12

Which accessory structure of a synovial joint reduces friction between tendons and bones?

Accepted Answer

Bursa

Question 13

Which of the following bones is part of the axial skeleton?

Accepted Answer

Sternum

Question 14

A patient is diagnosed with rickets, a disease caused by vitamin D deficiency. Which process is most directly impaired?

Accepted Answer

Mineralization of bone matrix

Question 15

Which of the following best explains why the epiphyseal plate is important during childhood and adolescence?

Accepted Answer

It allows for longitudinal growth of long bones.

Question 16

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

Accepted Answer

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

Question 17

Which of the following best describes the role of calcitonin in calcium homeostasis?

Accepted Answer

It decreases blood calcium by inhibiting osteoclasts.

Question 18

A 30-year-old athlete suffers a torn anterior cruciate ligament (ACL) in the knee. Which type of tissue is primarily damaged?

Accepted Answer

Dense regular connective tissue

Question 19

Which of the following best describes the difference between fibrous, cartilaginous, and synovial joints?

Accepted Answer

Fibrous joints are joined by dense connective tissue, cartilaginous joints are joined by cartilage, and synovial joints have a fluid-filled cavity.

Question 20

A patient with a pituitary tumor has abnormally high growth hormone levels after epiphyseal plate closure. What condition is most likely to develop?

Accepted Answer

Acromegaly

Skeletal System: Structure, Function, and Development – Study Notes

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