Question 1

Which of the following best explains why removal of the inorganic matrix from bone results in a structure that bends easily but does not shatter?

Accepted Answer

The inorganic matrix, composed mainly of hydroxyapatite $$Ca_{10}(PO_4$)_6(OH)_2$$, is responsible for bone rigidity and resistance to compression.

Question 2

A patient presents with abnormal bone fragility and frequent fractures. Histological analysis reveals a deficiency in collagen fibers within the bone matrix. Which component is most likely compromised?

Accepted Answer

Organic matrix (osteoid)

Question 3

Which bone cell type is primarily responsible for bone resorption, and what mechanism does it use to dissolve the inorganic matrix?

Accepted Answer

Osteoclasts; they secrete hydrogen ions ($$H^+) to $$create an acidic environment that dissolves hydroxyapatite.

Question 4

During endochondral ossification, which sequence correctly describes the transformation from cartilage to mature bone?

Accepted Answer

Hyaline cartilage model forms → perichondrium converts to periosteum → primary ossification center develops in diaphysis → secondary ossification centers form in epiphyses

Question 5

Which of the following bones is formed by intramembranous ossification?

Accepted Answer

Clavicle

Question 6

A child is diagnosed with gigantism due to a pituitary tumor. Which process is directly affected, and what is the underlying mechanism?

Accepted Answer

Longitudinal growth; hypersecretion of growth hormone stimulates chondrocyte proliferation in the epiphyseal plate

Question 7

Which structural feature distinguishes compact bone from spongy bone?

Accepted Answer

Presence of osteons (Haversian systems) with concentric lamellae and central canals

Question 8

A fracture occurs in the diaphysis of a long bone. Which region is most likely to contain yellow bone marrow in an adult?

Accepted Answer

Medullary cavity of the diaphysis

Question 9

Which of the following best describes the function of osteocytes within bone tissue?

Accepted Answer

They maintain the extracellular matrix and sense mechanical strain, recruiting osteoblasts as needed.

Question 10

Which equation represents the chemical formula for hydroxyapatite, the primary inorganic component of bone matrix?

Accepted Answer

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

Question 11

During longitudinal growth of a long bone, which zone of the epiphyseal plate is responsible for actively dividing chondrocytes that push the epiphysis away from the diaphysis?

Accepted Answer

Zone of proliferation

Question 12

Which bone shape class is characterized by bones that are embedded within tendons and serve to protect tendons from wear and increase muscle leverage?

Accepted Answer

Sesamoid bones

Question 13

Which of the following is TRUE regarding the blood supply to long bones?

Accepted Answer

The periosteum supplies roughly one-third of the bone's blood supply, while the majority enters via nutrient arteries through the nutrient foramen.

Question 14

Which scenario best illustrates the role of bone in acid-base homeostasis?

Accepted Answer

Bone absorbs or releases alkaline mineral salts and bicarbonate to buffer blood pH.

Question 15

Which of the following statements about the epiphyseal plate is correct?

Accepted Answer

It is a layer of hyaline cartilage responsible for longitudinal growth until it ossifies between ages 18–21.

Question 16

Which of the following is a function of yellow bone marrow in adults?

Accepted Answer

Storage of triglycerides for energy metabolism

Question 17

Which of the following best describes the mechanical response of bone to increased muscle contraction and tension?

Accepted Answer

Osteocytes sense mechanical strain and recruit osteoblasts to reinforce bone density.

Question 18

Which of the following is NOT a characteristic of secondary (lamellar) bone?

Accepted Answer

Irregularly arranged collagen bundles and abundant osteocytes

Question 19

Which joint movement is exemplified by turning the head side-to-side at the atlantoaxial joint ($$C_1$$-$$C_2$$)?

Accepted Answer

Rotation

Question 20

Which of the following best explains why osteons are absent in spongy bone?

Accepted Answer

Cells in spongy bone receive nutrients directly via diffusion from blood vessels in the marrow spaces, eliminating the need for central canals.

Anatomy & Physiology Study Notes: Bone Tissue, Skeleton, Joints, and Muscle Physiology

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