Chapter 7

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Questions and Answers

A patient presents with a joint that allows free movement in multiple planes. Based on this characteristic, which type of joint is MOST likely involved?

  • Cartilaginous
  • Hinge
  • Ball and socket (correct)
  • Fibrous

Which component of a synovial joint is responsible for reducing friction and providing lubrication during movement?

  • Joint capsule
  • Synovial membrane (correct)
  • Dense connective tissue
  • Articular cartilage

A gymnast is performing a routine that requires circular movements of the arm. Which type of joint is PRIMARILY responsible for enabling this movement?

  • Cartilaginous joint
  • Hinge joint
  • Ball and socket joint (correct)
  • Pivot joint

Which of the following joint types allows for uniaxial movement, similar to the opening and closing of a door?

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

A patient reports limited rotation of the neck. Which type of joint is MOST likely affected?

<p>Pivot joint (D)</p> Signup and view all the answers

Which of the following is the most accurate description of how Volkmann's canals contribute to bone function?

<p>They facilitate the transport of nutrients and nerve signals between adjacent osteons. (D)</p> Signup and view all the answers

How does the arrangement of trabeculae in spongy bone contribute to the bone's overall function?

<p>By aligning along lines of stress to provide strength and reduce weight. (A)</p> Signup and view all the answers

Which of the following is the primary role of the periosteum in bone structure?

<p>Serving as an attachment point for ligaments and tendons. (C)</p> Signup and view all the answers

Which type of bone is the patella classified as, and what is its distinct characteristic?

<p>Sesamoid Bone; distinguished by its development within a tendon. (A)</p> Signup and view all the answers

What is the functional significance of articular cartilage covering the epiphyses of long bones?

<p>It reduces friction and absorbs shock within joints. (D)</p> Signup and view all the answers

How does the structural arrangement of compact bone contribute to its function?

<p>The tightly packed osteons resist stress and provide support. (C)</p> Signup and view all the answers

Which of the following happens within the medullary cavity of a long bone?

<p>Storage of bone marrow. (B)</p> Signup and view all the answers

If a forensic scientist discovered a bone that was approximately equal in length and width, how would that bone likely be classified?

<p>Short bone (B)</p> Signup and view all the answers

Which of the following best describes the role of osteoblasts in bone tissue?

<p>Depositing new bone matrix to build and repair bone. (A)</p> Signup and view all the answers

How do osteocytes receive nutrients and eliminate waste within the dense bone matrix?

<p>Through tiny canals called canaliculi that connect lacunae. (D)</p> Signup and view all the answers

What is the primary function of osteoclasts?

<p>To break down bone tissue for remodeling and mineral release. (D)</p> Signup and view all the answers

Which hormone directly inhibits osteoclast activity when blood calcium levels are elevated?

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

Which of the following is NOT a primary function of bones?

<p>Regulation of body temperature. (A)</p> Signup and view all the answers

If a child has a deficiency in vitamin D, which process would be most affected?

<p>The absorption of calcium from the diet. (B)</p> Signup and view all the answers

A weightlifter notices an increase in bone density. Which factor is most directly contributing to this?

<p>The effect of muscle contraction stressing the bone. (D)</p> Signup and view all the answers

During intramembranous ossification, what type of tissue is directly replaced by bone tissue?

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

Which of the following is NOT part of the axial skeleton?

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

The trabeculae in spongy bone are organized to:

<p>Maximize weight-bearing capacity along lines of stress. (B)</p> Signup and view all the answers

Which type of joint classification allows for the greatest range of motion?

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

Which of the following best explains the sequence of events in intramembranous ossification?

<p>Mesenchyme differentiation, ossification center formation, trabeculae formation, periosteum development. (C)</p> Signup and view all the answers

The process of intramembranous ossification is responsible for forming which of the following bones?

<p>Parietal bone. (C)</p> Signup and view all the answers

What process is primarily responsible for increasing blood calcium levels when they drop too low?

<p>Bone resorption by osteoclasts (A)</p> Signup and view all the answers

Which of the following bones is formed through endochondral ossification?

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

What would happen if osteoclast activity surpassed osteoblast activity within bone tissue?

<p>The bone becomes more brittle and prone to fractures. (D)</p> Signup and view all the answers

Which of the following processes describes the role of chemical messengers in intramembranous ossification?

<p>Signaling mesenchymal cells to differentiate into osteogenic cells. (C)</p> Signup and view all the answers

What is the primary function of the hyoid bone?

<p>To support the tongue and aid in swallowing (C)</p> Signup and view all the answers

Which of the following is a function of the pelvic girdle?

<p>Attaching the lower limbs to the axial skeleton (A)</p> Signup and view all the answers

How do sex hormones affect bone development during puberty?

<p>They stimulate ossification of the epiphyseal plates, ending height growth. (B)</p> Signup and view all the answers

What is the initial tissue type that serves as a template during endochondral ossification?

<p>Hyaline cartilage (B)</p> Signup and view all the answers

During the growth of the cartilage model in endochondral ossification, what is the role of osteochondroprogenitor cells?

<p>They transform into osteoblasts, which calcify the outer surface of the diaphysis. (B)</p> Signup and view all the answers

What triggers the development of the primary ossification center during endochondral ossification?

<p>The creation of a bone collar around the cartilage model. (A)</p> Signup and view all the answers

How do osteoclasts contribute to the development of the medullary cavity during endochondral ossification?

<p>They carve out and remodel the bone in the diaphysis. (A)</p> Signup and view all the answers

When does the secondary ossification center typically develop during endochondral ossification?

<p>At the time of birth. (D)</p> Signup and view all the answers

What is the fate of most of the cartilage in the epiphyses after the development of the secondary ossification center?

<p>It is replaced by spongy bone, except for the articular cartilage and epiphyseal plate. (A)</p> Signup and view all the answers

Which of the following events is the MOST critical for initiating the development of both primary and secondary ossification centers?

<p>Angiogenesis into the cartilage model. (D)</p> Signup and view all the answers

What distinguishes endochondral ossification from intramembranous ossification?

<p>Endochondral ossification involves a cartilage intermediate. (A)</p> Signup and view all the answers

During endochondral ossification, what is the primary effect of the bone collar's formation on the chondrocytes within the cartilage model?

<p>Restriction of nutrient and oxygen supply, leading to chondrocyte death. (B)</p> Signup and view all the answers

If the process of medullary cavity formation was inhibited during endochondral ossification, what would be the MOST likely consequence?

<p>Impaired bone marrow production. (C)</p> Signup and view all the answers

Which characteristic is MOST important for classifying a joint as a synovial joint?

<p>The presence of a joint capsule and synovial fluid. (B)</p> Signup and view all the answers

A doctor is examining a patient who can move their arm in various directions, including rotation. Based on this information, which type of joint is MOST likely involved?

<p>Ball and socket joint (B)</p> Signup and view all the answers

In a pivot joint, like the one between the atlas and axis, what type of movement is permitted?

<p>Rotation around a central axis (D)</p> Signup and view all the answers

Which of the following structural components is responsible for reducing friction and providing cushioning within a synovial joint?

<p>The articular cartilage (D)</p> Signup and view all the answers

Which of the following features is MOST important for enabling the wide range of motion seen in ball-and-socket joints?

<p>The cup-shaped cavity of one bone articulating with the globular head of another. (D)</p> Signup and view all the answers

If a researcher is studying a bone sample primarily composed of trabeculae, which type of bone tissue are they MOST likely examining?

<p>Spongy bone from the epiphysis of a long bone. (A)</p> Signup and view all the answers

Considering the functions of bone, which scenario BEST illustrates the role of bones in storing inorganic salts?

<p>The release of calcium from bone tissue to maintain blood calcium levels. (B)</p> Signup and view all the answers

When comparing long bones to short bones, which of the following statements accurately describes a key structural difference?

<p>Long bones are characterized by a diaphysis and epiphyses, whereas short bones are more equal in length and width. (B)</p> Signup and view all the answers

A fracture near the epiphyseal plate of a long bone in a child is a concern because:

<p>It can potentially stunt the growth of the bone. (B)</p> Signup and view all the answers

Based on their shape, which bone would MOST likely play a significant role in protecting internal organs?

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

How do the central canals and perforating (Volkmann's) canals work together in compact bone?

<p>Central canals contain blood vessels and nerves, and Volkmann's canals connect them between osteons. (C)</p> Signup and view all the answers

In a microscopic study of bone tissue, a researcher observes a structure consisting of concentric rings of bone matrix with osteocytes residing in lacunae. What type of structure is the researcher MOST likely observing?

<p>An osteon (Haversian system) within compact bone (D)</p> Signup and view all the answers

An individual is diagnosed with a condition that reduces the function of their periosteum. Which of the following bone functions would be MOST affected by this condition?

<p>Bone remodeling and repair (A)</p> Signup and view all the answers

Which event directly triggers the development of the primary ossification center during endochondral ossification?

<p>Calcification of the outer surface of the diaphysis and formation of the bone collar. (A)</p> Signup and view all the answers

How do osteoclasts contribute to the overall process of endochondral ossification?

<p>By invading newly formed bone to carve out the medullary cavity. (D)</p> Signup and view all the answers

During endochondral ossification, what is the primary effect of blood vessel penetration into the cartilage model?

<p>It delivers nutrients and stimulates the differentiation of osteochondroprogenitor cells into osteoblasts. (A)</p> Signup and view all the answers

Which event marks the beginning of the development of the secondary ossification center during endochondral ossification?

<p>Penetration of blood vessels into the epiphyses. (C)</p> Signup and view all the answers

What primarily determines the shape and size of the bone that forms through endochondral ossification?

<p>The initial shape and dimensions of the hyaline cartilage model. (C)</p> Signup and view all the answers

During endochondral ossification, what is the role of the bone collar that forms around the diaphysis of the cartilage model?

<p>It restricts nutrient access to chondrocytes, leading to their death and initiating ossification. (A)</p> Signup and view all the answers

What best describes the fate of the hyaline cartilage after endochondral ossification is complete in a long bone?

<p>It persists as articular cartilage on the epiphyses and as the epiphyseal plate. (D)</p> Signup and view all the answers

If the formation of the bone collar around the cartilage model was inhibited, which of the following would be the MOST likely consequence during endochondral ossification?

<p>Failure of the primary ossification center to develop properly. (C)</p> Signup and view all the answers

Which of the following best illustrates the coordinated function of osteoblasts and osteoclasts in maintaining bone homeostasis?

<p>Osteoblasts deposit new bone matrix while osteoclasts simultaneously remove damaged or aged bone, ensuring continuous bone remodeling. (B)</p> Signup and view all the answers

During intramembranous ossification, what critical event ensures that newly formed osteocytes within the thickening osseous tissue remain viable?

<p>Reorganization of osseous tissue into trabeculae around a network of blood vessels. (C)</p> Signup and view all the answers

How does the development of the periosteum during intramembranous ossification contribute to the overall strength and structure of the bone?

<p>It provides a protective outer layer and facilitates the remodeling of spongy bone into compact bone. (B)</p> Signup and view all the answers

If the function of canaliculi were impaired, which of the following would be the most likely consequence for osteocytes?

<p>Inadequate nutrient supply and waste removal, leading to cell death. (A)</p> Signup and view all the answers

Which of the following is the MOST direct consequence of osteoblast dysfunction?

<p>Impaired bone remodeling and reduced bone density. (B)</p> Signup and view all the answers

How does the arrangement of collagen fibers within the extracellular matrix during intramembranous ossification contribute to bone strength?

<p>The multidirectional network of collagen fibers resists forces from various directions, enhancing overall bone strength. (A)</p> Signup and view all the answers

During intramembranous ossification, if chemical messengers that stimulate mesenchymal cell differentiation into osteoblasts were blocked, what would be the MOST likely outcome?

<p>Delayed or absent formation of the ossification center. (D)</p> Signup and view all the answers

How does the location of spongy bone contribute to bone function?

<p>Spongy bone located in the epiphyses transmits forces effectively and reduces overall bone weight. (A)</p> Signup and view all the answers

A decrease in physical exercise would MOST directly impact bone development by:

<p>Reducing the stress on bones, leading to decreased thickness and strength. (A)</p> Signup and view all the answers

If a patient's blood calcium levels are too high, which of the following hormonal responses would be expected?

<p>Inhibition of osteoclasts and stimulation of osteoblasts by calcitonin. (A)</p> Signup and view all the answers

How would a severe deficiency in vitamin D MOST directly affect bone development and homeostasis?

<p>Reducing the amount of calcium absorbed from the diet, hindering bone deposition. (B)</p> Signup and view all the answers

In a scenario where osteoclast activity is significantly greater than osteoblast activity, which of the following conditions is MOST likely to develop?

<p>Weakening of bones due to excessive mineral resorption. (C)</p> Signup and view all the answers

Which of the following BEST describes the role of sex hormones, such as estrogen and testosterone, in bone development?

<p>They initially promote bone formation but later stimulate epiphyseal plate ossification to end growth. (B)</p> Signup and view all the answers

A forensic anthropologist discovers a set of bones, including a clavicle and a scapula. Which skeletal division should these bones be categorized under?

<p>Appendicular skeleton. (A)</p> Signup and view all the answers

Which of the following joints is classified as synarthrotic?

<p>The sutures of the skull. (B)</p> Signup and view all the answers

The intervertebral discs, which allow limited movement between vertebrae, are classified as which type of joint based on their degree of movement?

<p>Amphiarthrotic. (D)</p> Signup and view all the answers

Flashcards

Bone Functions

Anchors muscles, shields organs, produces blood cells, stores minerals, supports weight, and enables movement.

Bone Shape Categories

Long, short, sesamoid (round), flat, and irregular.

Epiphysis

Expanded end forming a joint.

Diaphysis

The bone's shaft, the long, main portion.

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Articular Cartilage

Covers epiphyses to cushion joints.

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Periosteum

The bone's tough, outer covering.

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Medullary Cavity

Hollow chamber in the diaphysis.

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Compact Bone

Osteons tightly packed together.

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Trabeculae

Structural unit of spongy bone where osteocytes and extracellular matrix reside.

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Osteoblast

Bone-building cells that deposit bony matrix.

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Osteocyte

Mature bone cells encased in the bone matrix within lacunae.

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Canaliculi

Tiny canals that connect lacunae, allowing osteocytes to pass nutrients.

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Osteoclast

Bone-resorbing cells that break down the calcified matrix.

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Intramembranous Ossification

Directly from mesenchyme. Four steps: ossification center, calcification, trabeculae formation, periosteum development.

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Development of Ossification Center

Mesenchymal cells differentiate into osteoblasts, which secrete the ECM (collagen fibers).

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Calcification (Bone)

Mineral salts are deposited by osteoblasts; osteoblasts differentiate into osteocytes

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Formation of Trabeculae

Osseous tissue reorganizes into trabeculae to ensure osteocytes have access to blood vessels.

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Fibrous Joints

Dense connective tissue; synarthrotic (immovable).

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Cartilaginous Joints

Composed of cartilage; amphiarthrotic (slightly movable).

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Synovial Joints

Complex structure, diarthrotic (freely movable), lubricated by synovial fluid secreted from synovial membrane.

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Ball and Socket Joint

Globular head in a cup-shaped cavity; multiaxial movement in all planes; e.g., shoulder and hip.

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Hinge Joint

Convex surface into concave surface; uniaxial movement in one plane; e.g., elbow and phalanges.

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Endochondral Ossification

Bone formation process where cartilage is replaced by bone tissue.

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Initial Cartilage Model

Hyaline cartilage.

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Growth of Cartilage Model

The cartilage model grows in length and width, assuming the future bone's shape.

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Bone Collar

Calcified bone around the diaphysis of long bones that restricts nutrient access to chondrocytes.

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Primary Ossification Center

Region in the diaphysis where bone formation starts.

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Medullary Cavity Development

Osteoclasts carve this out, delivered by blood supply.

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Secondary Ossification Center

Blood vessels penetrate the epiphyses of long bones.

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Articular Cartilage Formation

Covers joint surfaces, remaining cartilage.

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Osteochondroprogenitor Cells

Stem cells in the perichondrium.

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Angiogenesis Definition

Formation of blood vessels in tissue.

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Parathyroid Hormone (PTH) Action

Increases blood calcium by stimulating osteoclasts.

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Calcitonin Action

Decreases blood calcium by inhibiting osteoclasts and activating osteoblasts.

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Bone Deposition

Rebuilding bone by depositing minerals from the bloodstream.

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Bone Resorption

Breakdown of bone tissue by osteoclasts, releasing minerals into the blood.

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Vitamin D & Bone Development

Vitamin crucial for calcium absorption, aiding bone development.

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Growth Hormone & Bone

Stimulates cartilage cell division in the epiphyseal plate.

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Axial Skeleton

Bones of the skull, vertebral column, hyoid and thoracic cage.

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Appendicular Skeleton

Bones of the limbs and girdles that attach them to the axial skeleton.

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Synarthrotic Joint

Immovable joint.

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Long Bones

Bones longer than wide, with expanded ends.

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Short Bones

Length and width are roughly equal.

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Sesamoid Bones

Small bones embedded within a tendon.

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Flat Bones

Thin, plate-like shape with a broad surface.

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Irregular Bones

Bones with a complex, varied shape.

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Compact Bone Structure

Tightly packed tissue forming the diaphysis wall.

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Osteons (Haversian Systems)

Structural units of compact bone, arranged in concentric layers.

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Spongy Bone

Made of trabeculae with marrow-filled spaces; epiphyses of long bones.

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Canaliculi Function

Tiny canals connecting lacunae, allowing nutrient and gas exchange.

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Bones Formed by Intramembranous Ossification

Flat bones of the skull, most facial bones, sternum, and medial clavicles. formed via intramembranous ossification.

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Endochondral Bones

Bones that develop from a cartilage model via endochondral ossification.

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Parathyroid Hormone (PTH)

Hormone that increases blood calcium levels by stimulating osteoclasts to break down bone.

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Calcitonin

Hormone that decreases blood calcium levels by inhibiting osteoclasts and activating osteoblasts.

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Amphiarthrotic

A slightly movable joint.

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Cartilage Model Growth

Hyaline cartilage model grows in length and width, determining the bone's future shape.

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Bone Collar Formation

Calcified bone around the diaphysis restricting nutrient access to chondrocytes.

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Angiogenesis.

Formation of blood vessels in tissue, stimulates differentiation to osteoblasts.

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Study Notes

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