Q: Which of the following equations correctly represents the formation of hydroxyapatite, the primary mineral in bone matrix?

$$10\text{Ca}^{2+} + 6\text{PO}_4$$^{3-}$$ + 2\text{OH}^- \rightarrow \text{Ca}_{10}(\text{PO}_4)_6(\text{OH})_2$$

Question 1

Which of the following best describes the main function of the axial skeleton?

Accepted Answer

It forms the longitudinal axis of the body and protects vital organs such as the brain, heart, and lungs.

Question 2

A patient presents with a fracture in the shaft of their femur. Which anatomical term best describes this region of the bone?

Accepted Answer

Diaphysis

Question 3

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

Accepted Answer

Osteoclasts

Question 4

Which process describes the formation of bone from a hyaline cartilage model, as seen in the development of most long bones?

Accepted Answer

Endochondral ossification

Question 5

A child presents with a greenstick fracture. Which of the following best explains why this type of fracture is more common in children?

Accepted Answer

Children's long bones have not fully ossified, making them more flexible.

Question 6

Which hormone increases blood calcium levels by stimulating osteoclast activity, enhancing intestinal absorption, and reducing urinary excretion of calcium?

Accepted Answer

Parathyroid hormone (PTH)

Question 7

Which of the following bone markings is defined as a small, rounded projection?

Accepted Answer

Tubercle

Question 8

During appositional bone growth, which structure is responsible for adding new layers of bone matrix to increase bone diameter?

Accepted Answer

Periosteum

Question 9

Which of the following best describes the functional significance of trabeculae in spongy bone?

Accepted Answer

They form a network that supports red bone marrow and reduces bone weight.

Question 10

A patient has a comminuted fracture. Which of the following best describes this type of fracture?

Accepted Answer

The bone is shattered into multiple fragments.

Question 11

Which of the following equations correctly represents the formation of hydroxyapatite, the primary mineral in bone matrix?

Accepted Answer

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

Question 12

Which of the following best explains why osteoporosis increases the risk of compression fractures in the vertebrae?

Accepted Answer

Osteoporosis decreases bone density, making bones more susceptible to collapse under pressure.

Question 13

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

Accepted Answer

Regulation of body temperature

Question 14

A patient with a parathyroid tumor is experiencing hypercalcemia. Which of the following best explains the physiological mechanism?

Accepted Answer

Excess PTH increases osteoclast activity, releasing more calcium from bone into the blood.

Question 15

Which of the following bone markings is a shallow depression or recess in a bone surface?

Accepted Answer

Fossa

Question 16

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

Accepted Answer

Compact bone is organized into osteons, while spongy bone consists of a network of trabeculae.

Question 17

Which of the following best describes the role of the periosteum in bone physiology?

Accepted Answer

It covers the outer surface of bone, contains osteogenic cells, and is essential for appositional growth and repair.

Question 18

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

Accepted Answer

Hematoma formation → Soft callus formation → Hard callus formation → Bone remodeling

Question 19

Which of the following best describes the effect of calcitonin on blood calcium levels?

Accepted Answer

It decreases blood calcium by inhibiting osteoclast activity and increasing calcium deposition in bone.

Question 20

A 10-year-old child has a fracture that passes through the epiphyseal plate. What is the most significant potential complication of this injury?

Accepted Answer

Impaired longitudinal bone growth at the site of injury

Bones and Bone Structure: Study Notes for ANP College Students

Study Guide - Practice Questions

Study Guide - Flashcards