BIOL 251 Module 4 Ultimate Exam Prep: Bone Histology, Joint Mechanics & Muscle Physiology Questions and Answers Graded A | 2026/2027

BIOL 251 Module 4 Ultimate Exam Prep: Bone Histology, Joint
Mechanics & Muscle Physiology Questions and Answers
Graded A | 2026/2027




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,Part 1: Bone Histology & Skeletal Physiology

Q1: Which structural unit of compact bone consists of concentric lamellae surrounding a central
canal?

• A) Trabecula

• B) Osteon

• C) Lacuna

• D) Canaliculus

• Answer: B — The osteon is the basic cylindrical unit of compact bone.

Q2: Which bone cell types are mature cells that reside within lacunae and maintain the bone
matrix?

• A) Osteoblasts

• B) Osteoclasts

• C) Osteocytes

• D) Osteoprogenitor cells

• Answer: C — Osteocytes are mature bone cells trapped in lacunae that monitor matrix
health.

Q3: What is the unmineralized organic component of bone matrix secreted by osteoblasts?

• A) Hydroxyapatite

• B) Calcium phosphate

• C) Osteoid

• D) Alkaline phosphatase

• Answer: C — Osteoid is the organic matrix consisting of collagen fibers and ground
substance.

Q4: Which cell type undergoes mitosis and differentiates into osteoblasts?

• A) Osteoclast

• B) Osteocyte

, • C) Osteoprogenitor cell

• D) Fibroblast

• Answer: C — Osteoprogenitor cells are mesenchymal stem cells destined to become
bone-building cells.

Q5: What inorganic crystal molecule gives bone its exceptional hardness and compression
resistance?

• A) Collagen type I

• B) Hydroxyapatite

• C) Chondroitin sulfate

• D) Sodium chloride

• Answer: B — Hydroxyapatite is a mineral salt made of calcium phosphate crystals.

Q6: Which cells are giant, multinucleated cells derived from white blood cell lineages that
resorb bone?

• A) Osteocytes

• B) Osteoblasts

• C) Osteoclasts

• D) Chondrocytes

• Answer: C — Osteoclasts break down bone matrix using lysosomal enzymes and acids.

Q7: Through which microscopic channels do osteocyte cytoplasmic extensions communicate via
gap junctions?

• A) Perforating canals

• B) Central canals

• C) Canaliculi

• D) Volkmann's canals

• Answer: C — Canaliculi link lacunae together to share nutrients and chemical signals.

Q8: What canals run perpendicular to the osteon long axis to bring blood vessels from the
periosteum deep into the bone?

, • A) Haversian canals

• B) Perforating (Volkmann's) canals

• C) Canaliculi

• D) Nutrient foramina

• Answer: B — Perforating canals connect the vascular supplies of the periosteum and
central canals.

Q9: Where is red bone marrow primarily located in adult skeletons?

• A) Medullary cavities of long bone shafts

• B) Inside the central canals of osteons

• C) Between the trabeculae of spongy bone

• D) Within the fibrous layer of the periosteum

• Answer: C — Spongy bone trabeculae in the epiphyses and flat bones house red marrow.

Q10: Which type of bone development forms the flat bones of the skull and the clavicles
directly from mesenchymal membranes?

• A) Endochondral ossification

• B) Intramembranous ossification

• C) Appositional growth

• D) Interstitial growth

• Answer: B — Intramembranous ossification develops bone directly within fibrous
connective tissue.

Q11: During endochondral ossification, what serves as the initial scaffolding model before bone
replaces it?

• A) Elastic cartilage

• B) Fibrocartilage

• C) Hyaline cartilage

• D) Dense regular connective tissue

• Answer: C — Long bones form by replacing a miniature model made of hyaline cartilage.