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Questions and Answers

Which statement accurately describes the function of osteoblasts during bone development?

  • Osteoblasts differentiate from osteoclasts.
  • Osteoblasts break down existing bone tissue.
  • Osteoblasts secrete organic matrix that later calcifies. (correct)
  • Osteoblasts primarily form bone marrow.

What is the significance of the periosteum in bone formation?

  • It holds cartilage in place.
  • It serves solely for cushioning the bone.
  • It is a layer from which osteoblasts originate. (correct)
  • It regulates blood flow to the bone.

What does the primary ossification center primarily give rise to?

  • Both spongy and compact bone. (correct)
  • Only compact bone.
  • Only bone marrow.
  • Only spongy bone.

What happens to the structure of spongy bone during the transition to compact bone?

<p>It becomes more calcified and rearranged. (B)</p> Signup and view all the answers

How do larger bones develop their complex structure?

<p>By fusing together pieces from multiple primary ossification centers. (D)</p> Signup and view all the answers

At what stage of development do the secondary ossification centers typically form?

<p>After birth, except in certain exceptions. (C)</p> Signup and view all the answers

Which type of bone marrow is primarily responsible for hematopoiesis?

<p>Red bone marrow. (A)</p> Signup and view all the answers

What defines cancellous bone in terms of structure compared to compact bone?

<p>It has a complex network of trabeculae. (C)</p> Signup and view all the answers

What is primarily stored in bones to maintain normal concentrations in the body?

<p>Calcium salts (B)</p> Signup and view all the answers

What are the main components of cancellous bone?

<p>Filled with bone marrow and reticular tissue (A)</p> Signup and view all the answers

How does the Haversian system primarily enhance bone functionality?

<p>By providing nutrient-rich blood supply (A)</p> Signup and view all the answers

Which type of bone marrow is primarily involved in blood cell production?

<p>Red marrow (C)</p> Signup and view all the answers

What characteristic defines the structure of compact bone?

<p>Consists of tightly packed osteons (B)</p> Signup and view all the answers

What type of bone is classified as irregular due to its various shapes?

<p>Vertebra (C)</p> Signup and view all the answers

Which of these functions is NOT associated with the skeletal system?

<p>Hormonal regulation (C)</p> Signup and view all the answers

What is a primary role of sesamoid bones?

<p>To act as sites for tendon attachment (D)</p> Signup and view all the answers

Which anatomical classification represents long, tubular bones?

<p>Long bones (B)</p> Signup and view all the answers

What distinguishes pneumatic bones from other bone types?

<p>They contain large spaces filled with air. (A)</p> Signup and view all the answers

Which of the following is a characteristic of cancellous bone?

<p>Presence of trabecular networks (D)</p> Signup and view all the answers

Which type of bone possesses no periosteum due to its embedded nature?

<p>Sesamoid bones (C)</p> Signup and view all the answers

What is the role of bone remodeling in the skeletal system?

<p>To replace old bone tissue with new bone tissue (A)</p> Signup and view all the answers

What is a common function attributed to the skeletal system?

<p>Protecting internal organs (C)</p> Signup and view all the answers

Which statement best describes the remodeling process of bone tissue?

<p>Bone remodeling is influenced by both osteoblasts and osteoclasts. (B)</p> Signup and view all the answers

What is the primary function of the Haversian system within compact bone?

<p>It facilitates the circulation of blood and nutrients. (D)</p> Signup and view all the answers

Which characteristic is fundamental to the structure of compact bone?

<p>It consists of a dense arrangement of osteocytes within lacunae. (B)</p> Signup and view all the answers

What is a defining feature of cancellous bone?

<p>It consists of a meshwork of trabeculae with interconnecting spaces. (C)</p> Signup and view all the answers

Which type of bone marrow is primarily responsible for the production of blood cells?

<p>Red marrow (B)</p> Signup and view all the answers

What is the role of osteoblasts in bone tissue?

<p>They create new bone matrix. (B)</p> Signup and view all the answers

What distinguishes lamellar bones from woven bones?

<p>Lamellar bones are stronger and less flexible. (C)</p> Signup and view all the answers

Which feature is NOT characteristic of the Haversian system?

<p>Is primarily found in cancellous bone. (D)</p> Signup and view all the answers

Which structure primarily facilitates nutrient supply to the inner parts of the bone?

<p>Haversian canals (A)</p> Signup and view all the answers

What occurs when there is inactivity regarding bone density?

<p>Bone may thin and become brittle. (B)</p> Signup and view all the answers

Which of the following is true about cancellous bone's adaptation to forces?

<p>It adapts to compressive forces. (C)</p> Signup and view all the answers

Which component is NOT part of the extracellular matrix of bone?

<p>Hematopoietic cells (A)</p> Signup and view all the answers

Which type of ossification occurs when mesenchyme cells develop directly into bone?

<p>Intramembranous ossification (C)</p> Signup and view all the answers

The trabecular structure of cancellous bone enhances which of the following?

<p>Lightweight composition (D)</p> Signup and view all the answers

Which layer of the periosteum corresponds with the cellular layer involved in growth and repair?

<p>Inner cellular layer (D)</p> Signup and view all the answers

Flashcards

Osteology

The study of bones, including their structure, classification, development, and function.

Axial Skeleton

The part of the skeleton that forms the central axis of the body, including the skull, vertebral column, and thorax.

Appendicular Skeleton

The part of the skeleton that includes the limbs and their girdles (shoulders and pelvis).

Long Bone

A bone characterized by a long shaft (diaphysis) and two expanded ends (epiphyses), primarily for strong support and movement.

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Short Bone

A bone that is roughly cube-shaped, providing stability and support in joints where limited movement is needed.

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Flat Bone

A bone that is thin and flattened, designed to provide broad surfaces for muscle attachment and protection of underlying structures.

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Irregular Bone

A bone with a complex shape that doesn't fit into the other categories, often supporting specific functions or protecting internal structures.

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Pneumatic Bone

A bone containing air spaces (sinuses), usually in the skull, for reasons such as reducing weight and enhancing voice resonance.

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Sesamoid Bone

A small, round bone embedded within tendons or joint capsules, acting to improve tendon function, alter forces, and reduce friction.

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Compact Bone

Dense, hard bone tissue that forms the outer layer of bones and provides strength and protection.

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Cancellous Bone

Spongy bone tissue containing numerous interconnected spaces filled with bone marrow; provides strength with lightweight features.

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Bone Marrow

Tissue within bones that produces blood cells (red marrow for red blood cells and some white blood cells; yellow marrow for fat storage).

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Hematopoiesis

The process of blood cell formation occurring in bone marrow.

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Skeletal System

The organ system consisting of bones, joints, and associated connective tissues that provide structure, support, movement, and protection.

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Gross Anatomy

The study of the body's structures that can be seen with the naked eye.

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Joint Cartilage

Specialized connective tissue that cushions and protects the ends of bones at joints.

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Periosteum

Tough, fibrous membrane covering the outer surface of bones, except at joints.

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Osseous Tissue

Specialized connective tissue forming the bulk of bones.

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Endosteum

Thin membrane lining the inner surface of bones.

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Medullar Cavity

The hollow space within the diaphysis of long bones, filled with bone marrow.

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Bone Marrow

Soft tissue filling the medullary cavity; red marrow produces blood cells, yellow marrow stores fat.

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Compact Bone

Dense, solid bone tissue that forms the outer layer of bones.

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Cancellous Bone

Spongy bone tissue, with a porous network of trabeculae, found inside bones.

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Osteon

Functional unit of compact bone; a cylinder-shaped structure.

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Trabeculae

Thin, branching structures forming the framework of cancellous bone.

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Osteocyte

Mature bone cell residing in a lacunae within the bone matrix.

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Osteoblast

Bone-forming cell that synthesizes bone matrix.

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Osteoclast

Bone-resorbing cell; breaks down bone tissue.

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Bone Development

Process of bone formation and growth, occurring both prenatally and postnatally.

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Intramembranous Ossification

Bone formation directly from mesenchyme (connective tissue).

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Endochondral Ossification

Bone formation that replaces a cartilage model.

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Primary Ossification Center

The initial location of bone development within a bone, where mesenchymal cells differentiate into osteoblasts that form the initial bone structure.

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Osteoblasts

Bone-forming cells that secrete the organic matrix of bone, a process that eventually calcifies.

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Endochondral Ossification

Bone development that replaces a cartilage model of the bone, starting during fetal development, but incomplete in some bones.

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Early Spongy Bone

The initial, porous bone structure formed from the activity of osteoblasts laying down trabeculae.

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Secondary Ossification Centers

Additional centers of bone development that occur after birth in long bones, leading to further bone growth.

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Bone Collar Formation

The initial layer of bone laid down on the external surface of a cartilage model, signaling the start of endochondral ossification.

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Mesenchymal Cells

Stem cells of the connective tissues that differentiate first into osteogenic cells and then into osteoblasts

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Incomplete Bone Fusion

The process of bone development in which the fusion of bone parts may not be complete at birth, such as in the infant skull.

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Related Documents

Osteology - Introduction PDF

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