BIOL 251 Module 3 Exam Q&A (Portage
Learning 2026) – Bones & Skeletal Tissue
Questions And Well Graded Solutions With
Rationales Updated 2026-2027
Master your BIOL 251 Human Anatomy & Physiology I Module 3 Exam with this 2026 Portage Learning
study pack. Features high-yield, premium multiple-choice questions with bold italicized answers
and detailed conceptual rationales. Covers bone shapes, compact bone histology (osteons,
canaliculi), bone cells (osteoclasts, osteoblasts), ossification, axial/appendicular landmarks, and
synovial joints. Perfect for pre-nursing students aiming for an A on their lab practical and module
exam
1. Which classification of bone is generally cube-shaped and contains primarily spongy
bone?
A) Long bone
B) Short bone
C) Flat bone
D) Irregular bone
Answer: B) Short bone
Rationale: Short bones, such as the carpals in the wrist and tarsals in the ankle, are
roughly cube-shaped and consist predominantly of spongy bone covered by a thin
layer of compact bone.
2. The structural unit of compact bone is known as a(n):
A) Osteon
B) Canaliculus
C) Lacuna
D) Lamella
Answer: A) Osteon
Rationale: The osteon, or Haversian system, is the fundamental microscopic, weight-
bearing structural unit of mature compact bone.
3. What tiny, hair-like canals connect the lacunae to each other and to the central canal
to allow nutrient transfer?
A) Volkmann's canals
B) Canaliculi
C) Lamellae
D) Perforating fibers
Answer: B) Canaliculi
, Rationale: Canaliculi are microscopic canals that cross through the hard bone matrix,
linking osteocytes together so they can share nutrients and metabolic wastes.
4. Which bone cells are mitotically active stem cells that differentiate into bone-building
cells?
A) Osteoclasts
B) Osteocytes
C) Osteoblasts
D) Osteogenic cells
Answer: D) Osteogenic cells
Rationale: Osteogenic (or osteoprogenitor) cells are squamous stem cells located in
the periosteum and endosteum that divide to produce osteoblasts.
5. The organic component of the bone matrix secreted by osteoblasts that provides
tensile strength is called:
A) Hydroxyapatite
B) Osteoid
C) Calcium phosphate
D) Osteolysis
Answer: B) Osteoid
Rationale: Osteoid makes up about one-third of the bone matrix and consists of
collagen fibers and ground substance, giving bone its flexibility and tensile strength.
6. What type of ossification forms the flat bones of the skull and the clavicles?
A) Endochondral ossification
B) Intramembranous ossification
C) Appositional growth
D) Interstitial growth
Answer: B) Intramembranous ossification
Rationale: Intramembranous ossification develops directly from mesenchymal
(fibrous) connective tissue membranes without utilizing a cartilage model.
7. In the epiphyseal plate, cartilage cells undergo rapid mitosis and stack up like coins
in which specific zone?
A) Proliferation zone
B) Hypertrophic zone
C) Calcification zone
D) Ossification zone
Answer: A) Proliferation zone
Rationale: The proliferation (or growth) zone features cartilage cells rapidly dividing,
pushing the epiphysis away from the diaphysis to lengthen the bone.
,8. Which hormone is released by the parathyroid glands when blood calcium levels
drop?
A) Calcitonin
B) Thyroid hormone
C) Parathyroid hormone (PTH)
D) Growth hormone
Answer: C) Parathyroid hormone (PTH)
Rationale: PTH is secreted in response to low blood calcium levels; it stimulates
osteoclasts to degrade bone matrix and release calcium back into the bloodstream.
9. What is the very first stage in the structural repair sequence of a fractured bone?
A) Bony callus formation
B) Fibrocartilaginous callus formation
C) Bone remodeling
D) Hematoma formation
Answer: D) Hematoma formation
Rationale: When a bone breaks, blood vessels rupture, forming a localized mass of
clotted blood known as a hematoma within hours of the injury.
10. A sharp, slender, often pointed projection on a bone used for muscle or ligament
attachment is called a:
A) Spine
B) Tuberosity
C) Crest
D) Trochanter
Answer: A) Spine
Rationale: A spine is a sharp, slender projection. Examples include the spine of the
scapula or the spinous processes of vertebrae.
11. Which cranial bone contains the foramen magnum and articulates with the atlas?
A) Temporal bone
B) Frontal bone
C) Occipital bone
D) Sphenoid bone
Answer: C) Occipital bone
Rationale: The occipital bone forms the posterior base of the skull, features the
foramen magnum for the spinal cord, and has occipital condyles that sit on the atlas
(C1).
12. The master endocrine gland, the pituitary gland, sits securely inside which specific
structure?
A) Crista galli
, B) Sella turcica
C) Cribriform plate
D) Mandibular fossa
Answer: C) Sella turcica
Rationale: The sella turcica is a saddle-like depression located in the center of the
sphenoid bone that safely cradles the pituitary gland.
13. Which facial bones form the upper jaw and hold the upper teeth?
A) Mandible bones
B) Zygomatic bones
C) Palatine bones
D) Maxillae bones
Answer: D) Maxillae bones
Rationale: The paired maxillae fuse medially to form the upper jaw, contain the
alveoli for upper teeth, and form the anterior portion of the hard palate.
14. How many cervical vertebrae are typically found in the human vertebral column?
A) 5
B) 7
C) 12
D) 1
Answer: B) 7
Rationale: The neck region consists of exactly 7 cervical vertebrae, structurally
designated as C1 through C7.
15. What unique feature distinguishes thoracic vertebrae from all other vertebrae?
A) Transverse foramina
B) Bifid spinous processes
C) Costal facets for rib articulation
D) Large, kidney-shaped bodies
Answer: C) Costal facets for rib articulation
Rationale: Thoracic vertebrae (T1–T12) uniquely feature superior, inferior, and
transverse costal facets where the ribs attach to the spine.
16. Which abnormal spinal curvature is characterized by an exaggerated lateral
deviation of the column?
A) Lordosis
B) Kyphosis
C) Scoliosis
D) Stenosis
Answer: C) Scoliosis
Learning 2026) – Bones & Skeletal Tissue
Questions And Well Graded Solutions With
Rationales Updated 2026-2027
Master your BIOL 251 Human Anatomy & Physiology I Module 3 Exam with this 2026 Portage Learning
study pack. Features high-yield, premium multiple-choice questions with bold italicized answers
and detailed conceptual rationales. Covers bone shapes, compact bone histology (osteons,
canaliculi), bone cells (osteoclasts, osteoblasts), ossification, axial/appendicular landmarks, and
synovial joints. Perfect for pre-nursing students aiming for an A on their lab practical and module
exam
1. Which classification of bone is generally cube-shaped and contains primarily spongy
bone?
A) Long bone
B) Short bone
C) Flat bone
D) Irregular bone
Answer: B) Short bone
Rationale: Short bones, such as the carpals in the wrist and tarsals in the ankle, are
roughly cube-shaped and consist predominantly of spongy bone covered by a thin
layer of compact bone.
2. The structural unit of compact bone is known as a(n):
A) Osteon
B) Canaliculus
C) Lacuna
D) Lamella
Answer: A) Osteon
Rationale: The osteon, or Haversian system, is the fundamental microscopic, weight-
bearing structural unit of mature compact bone.
3. What tiny, hair-like canals connect the lacunae to each other and to the central canal
to allow nutrient transfer?
A) Volkmann's canals
B) Canaliculi
C) Lamellae
D) Perforating fibers
Answer: B) Canaliculi
, Rationale: Canaliculi are microscopic canals that cross through the hard bone matrix,
linking osteocytes together so they can share nutrients and metabolic wastes.
4. Which bone cells are mitotically active stem cells that differentiate into bone-building
cells?
A) Osteoclasts
B) Osteocytes
C) Osteoblasts
D) Osteogenic cells
Answer: D) Osteogenic cells
Rationale: Osteogenic (or osteoprogenitor) cells are squamous stem cells located in
the periosteum and endosteum that divide to produce osteoblasts.
5. The organic component of the bone matrix secreted by osteoblasts that provides
tensile strength is called:
A) Hydroxyapatite
B) Osteoid
C) Calcium phosphate
D) Osteolysis
Answer: B) Osteoid
Rationale: Osteoid makes up about one-third of the bone matrix and consists of
collagen fibers and ground substance, giving bone its flexibility and tensile strength.
6. What type of ossification forms the flat bones of the skull and the clavicles?
A) Endochondral ossification
B) Intramembranous ossification
C) Appositional growth
D) Interstitial growth
Answer: B) Intramembranous ossification
Rationale: Intramembranous ossification develops directly from mesenchymal
(fibrous) connective tissue membranes without utilizing a cartilage model.
7. In the epiphyseal plate, cartilage cells undergo rapid mitosis and stack up like coins
in which specific zone?
A) Proliferation zone
B) Hypertrophic zone
C) Calcification zone
D) Ossification zone
Answer: A) Proliferation zone
Rationale: The proliferation (or growth) zone features cartilage cells rapidly dividing,
pushing the epiphysis away from the diaphysis to lengthen the bone.
,8. Which hormone is released by the parathyroid glands when blood calcium levels
drop?
A) Calcitonin
B) Thyroid hormone
C) Parathyroid hormone (PTH)
D) Growth hormone
Answer: C) Parathyroid hormone (PTH)
Rationale: PTH is secreted in response to low blood calcium levels; it stimulates
osteoclasts to degrade bone matrix and release calcium back into the bloodstream.
9. What is the very first stage in the structural repair sequence of a fractured bone?
A) Bony callus formation
B) Fibrocartilaginous callus formation
C) Bone remodeling
D) Hematoma formation
Answer: D) Hematoma formation
Rationale: When a bone breaks, blood vessels rupture, forming a localized mass of
clotted blood known as a hematoma within hours of the injury.
10. A sharp, slender, often pointed projection on a bone used for muscle or ligament
attachment is called a:
A) Spine
B) Tuberosity
C) Crest
D) Trochanter
Answer: A) Spine
Rationale: A spine is a sharp, slender projection. Examples include the spine of the
scapula or the spinous processes of vertebrae.
11. Which cranial bone contains the foramen magnum and articulates with the atlas?
A) Temporal bone
B) Frontal bone
C) Occipital bone
D) Sphenoid bone
Answer: C) Occipital bone
Rationale: The occipital bone forms the posterior base of the skull, features the
foramen magnum for the spinal cord, and has occipital condyles that sit on the atlas
(C1).
12. The master endocrine gland, the pituitary gland, sits securely inside which specific
structure?
A) Crista galli
, B) Sella turcica
C) Cribriform plate
D) Mandibular fossa
Answer: C) Sella turcica
Rationale: The sella turcica is a saddle-like depression located in the center of the
sphenoid bone that safely cradles the pituitary gland.
13. Which facial bones form the upper jaw and hold the upper teeth?
A) Mandible bones
B) Zygomatic bones
C) Palatine bones
D) Maxillae bones
Answer: D) Maxillae bones
Rationale: The paired maxillae fuse medially to form the upper jaw, contain the
alveoli for upper teeth, and form the anterior portion of the hard palate.
14. How many cervical vertebrae are typically found in the human vertebral column?
A) 5
B) 7
C) 12
D) 1
Answer: B) 7
Rationale: The neck region consists of exactly 7 cervical vertebrae, structurally
designated as C1 through C7.
15. What unique feature distinguishes thoracic vertebrae from all other vertebrae?
A) Transverse foramina
B) Bifid spinous processes
C) Costal facets for rib articulation
D) Large, kidney-shaped bodies
Answer: C) Costal facets for rib articulation
Rationale: Thoracic vertebrae (T1–T12) uniquely feature superior, inferior, and
transverse costal facets where the ribs attach to the spine.
16. Which abnormal spinal curvature is characterized by an exaggerated lateral
deviation of the column?
A) Lordosis
B) Kyphosis
C) Scoliosis
D) Stenosis
Answer: C) Scoliosis
