Bone Structure and Function

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

A fracture in the diaphysis of a bone would be located in what region?

  • Articular cartilage
  • Diaphysis (correct)
  • Epiphysis
  • Periosteum

Where would you expect to find endosteum in a long bone?

  • Lining the medullary cavity (correct)
  • At articular surfaces
  • Covering bones
  • Lining the epiphysis

Muscle tendon fibers attach to bone by interlacing directly with what structure?

  • Endosteum
  • Ligaments
  • Periosteum (correct)
  • Compact bone

Which of the following best describes the composition of the organic matrix of bone?

<p>All of the above (D)</p> Signup and view all the answers

During bone formation, which cells are directly responsible for producing the initial organic matrix?

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

Which type of cell is primarily responsible for the active erosion of bone minerals?

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

Which function is NOT typically associated with bones?

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

Which intracellular structures are most active in synthesizing the organic components of bone matrix during bone formation?

<p>Endoplasmic reticulum and Golgi apparatus (B)</p> Signup and view all the answers

What is the primary function of the osteon, or Haversian system?

<p>Delivers nutrients to and removes waste products from bone cells (A)</p> Signup and view all the answers

What aspect of intramembranous ossification does appositional growth specifically refer to?

<p>Addition of an outside layer of osseous tissue on flat bones (C)</p> Signup and view all the answers

Which site is responsible for hematopoiesis in adults?

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

Where is the primary ossification center located in a long bone?

<p>In the diaphysis (A)</p> Signup and view all the answers

What is the primary role of the epiphyseal plate?

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

What is typically the first step in the process of healing a bone fracture?

<p>The formation of a fracture hematoma (C)</p> Signup and view all the answers

At what age range does bone loss typically begin to exceed bone gain?

<p>35 and 40 (D)</p> Signup and view all the answers

The enlargement of the medullary cavity during bone growth is primarily due to the activity of which cells?

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

Which type of cartilage is the most abundant in the human body?

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

What type of cartilage primarily composes the external ear?

<p>Elastic cartilage (A)</p> Signup and view all the answers

How will vitamin A and protein deficiency influence epiphyseal plates during bone growth in young children

<p>Cause a decrease in the thickness of epiphyseal plates in the growing long bones (D)</p> Signup and view all the answers

Which substance is NOT a typical component of the inorganic matrix of bone?

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

What occurs when osteoblast activity increases?

<p>Both B and C occur (A)</p> Signup and view all the answers

What effect does increased osteoclast activity have on calcium levels in the body?

<p>Level of calcium in the blood increases (B)</p> Signup and view all the answers

How are sesamoid bones classified?

<p>Irregular bones (A)</p> Signup and view all the answers

Which of the following does NOT describe the diaphysis?

<p>Provides a bulbous shape for attachment of muscle (A)</p> Signup and view all the answers

Which statement is NOT characteristic of the epiphyses of long bones?

<p>Cylindrical in shape (B)</p> Signup and view all the answers

Which physiological process is LEAST dependent on proper calcium ion concentration in the blood?

<p>All of the above are dependent on the proper amount of calcium ions in the blood (D)</p> Signup and view all the answers

Parathyroid hormone (PTH) influences all of these processes EXCEPT which one?

<p>Stimulation of the activity of osteoblasts (D)</p> Signup and view all the answers

Which statement is true of bone but NOT true of cartilage?

<p>Canals link blood vessels and cells (D)</p> Signup and view all the answers

Which structure in the body is NOT primarily composed of hyaline cartilage?

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

Which of the following structures is NOT made of elastic cartilage?

<p>Tip of the nose (C)</p> Signup and view all the answers

What statement best describes the composition of long, short, irregular and flat bones?

<p>All types of bones are composed of both compact and spongy bone (C)</p> Signup and view all the answers

What is another term for spongy bone?

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

Which of the following is an example of a long bone?

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

To which bone category does a vertebra belong?

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

Which category describes the tarsal bones?

<p>Short bones (A)</p> Signup and view all the answers

How should a scapula be classified based on its shape?

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

In terms of composition, what best describes the matrix of bone?

<p>Mostly inorganic salts with a lesser amount of organic material (D)</p> Signup and view all the answers

Approximately what percentage of the total inorganic matrix is comprised of hydroxyapatite crystals?

<p>85% (B)</p> Signup and view all the answers

What condition may result from vitamin D deficiency in children?

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

How are the lengthwise-running central canals within compact bone connected to each other?

<p>Volkmann canals (B)</p> Signup and view all the answers

How does increased activity of osteoblasts affect bone matrix and blood calcium levels?

<p>Increases bone matrix deposition while decreasing blood calcium levels. (B)</p> Signup and view all the answers

Which of the following best illustrates appositional bone growth?

<p>Osteoblasts deposit new bone matrix on the outer surface of the diaphysis, increasing its diameter. (C)</p> Signup and view all the answers

If a child is diagnosed with a condition that impairs the function of osteoclasts, what is the most likely direct consequence?

<p>Increased bone density due to unchecked bone formation. (D)</p> Signup and view all the answers

How do hormones like estrogen and testosterone primarily influence bone remodeling?

<p>By modulating the rate of both osteoblast and osteoclast activity. (A)</p> Signup and view all the answers

Why is maintaining blood calcium levels within a narrow range crucial?

<p>It is critical for nerve function, muscle contraction, and blood clotting in addition to bone health. (A)</p> Signup and view all the answers

How does the arrangement of collagen fibers within bone contribute to its overall function?

<p>Collagen provides flexibility and resistance to tensile forces, preventing fractures. (B)</p> Signup and view all the answers

What is the functional significance of canaliculi in compact bone?

<p>They allow osteocytes to communicate and exchange nutrients and waste. (B)</p> Signup and view all the answers

In which scenario would increased activity of parathyroid hormone (PTH) be most likely observed?

<p>When blood calcium levels are lower than normal. (D)</p> Signup and view all the answers

Which of the following explains why fractures in long bones are generally more serious than fractures in flat bones?

<p>Long bones are critical for weight-bearing and movement, so fractures significantly impair mobility. (D)</p> Signup and view all the answers

If a patient's blood tests reveal elevated levels of calcium and phosphate, along with increased alkaline phosphatase activity, which cellular activity is likely heightened?

<p>Osteoblast activity as well as bone deposition (C)</p> Signup and view all the answers

Flashcards

What is the diaphysis?

The main shaft of a long bone.

What is the endosteum?

Lines the medullary cavity within a bone.

What is the periosteum?

Muscle tendon fibers attach by interweaving with this structure.

What is the organic matrix of bone composed of?

Collagenous fibers, protein, polysaccharides.

Signup and view all the flashcards

What are osteoblasts?

Cells that produce the organic matrix in bone formation.

Signup and view all the flashcards

What are osteoclasts?

Cells responsible for active erosion of bone minerals.

Signup and view all the flashcards

What are the primary functions of bones?

Mineral storage, protection, and hematopoiesis.

Signup and view all the flashcards

What cell organelles synthesize organic matrix substance in bone formation?

Endoplasmic reticulum and Golgi apparatus.

Signup and view all the flashcards

What is the function of the osteon/Haversian system?

Delivers nutrients and removes waste from bone cells.

Signup and view all the flashcards

What is appositional growth?

Addition of an outside layer of osseous tissue on flat bones.

Signup and view all the flashcards

Where does hematopoiesis occur?

Red bone marrow

Signup and view all the flashcards

The Major Purpose of the epiphyseal plate

Lengthening of long bones.

Signup and view all the flashcards

What is initial step in healing a fracture?

Formation of a fracture hematoma.

Signup and view all the flashcards

Normally, when does bone loss exceed bone again?

35 and 40

Signup and view all the flashcards

Which cells causes enlargement of the medullary cavity?

Osteoclasts

Signup and view all the flashcards

What is the most abundant type of cartilage?

Hyaline

Signup and view all the flashcards

External Ear cartilage formed of what?

Elastic cartilage.

Signup and view all the flashcards

Vitamin A and protein deficiency impact on epiphyseal plates

Cause a decrease in thickness of epiphyseal plates

Signup and view all the flashcards

Which substance isn't part of the inorganic matrix

Collagen

Signup and view all the flashcards

When osteoblast activity increases, what happens to calcium?

Amount of calcium in bone increases

Signup and view all the flashcards

When osteoclast activity increases, what happens to calcium level in blood?

Level of calcium in the blood increases

Signup and view all the flashcards

Sesamoid bones are classified as:

Irregular bones

Signup and view all the flashcards

Which is NOT a characteristic of the diaphysis:

Provides a bulbous shape for attachment of muscle

Signup and view all the flashcards

Which of the following is NOT characteristic of epiphyses?

Cylindrical in shape

Signup and view all the flashcards

What's not dependent on calcium ions?

Transmission of nerve impulses

Signup and view all the flashcards

What is NOT caused by parathyroid hormone?

Stimulation of the activity of osteoblasts

Signup and view all the flashcards

Which is TRUE of bone but not cartilage?

Canals link blood vessels and cells

Signup and view all the flashcards

Which is NOT made of hyaline cartilage?

External ear

Signup and view all the flashcards

Which is NOT made of elastic cartilage?

Tip of the nose

Signup and view all the flashcards

Which type of bone consists only of compact bone?

All types of bones are composed of both compact and spongy bone

Signup and view all the flashcards

Cancellous bone is another term for:

Spongy

Signup and view all the flashcards

The humerus is an example of what?

Long Bone

Signup and view all the flashcards

Which bone provides support for spinal column?

Vertebrae

Signup and view all the flashcards

The tarsal bones are examples of?

Short bones

Signup and view all the flashcards

The scapula is an example of?

Flat Bone

Signup and view all the flashcards

The bone matrix makes of what?

Mostly inorganic salts with a lesser amount of organic material

Signup and view all the flashcards

How much hydroxyapatite crystals matrix?

85%

Signup and view all the flashcards

Deficiency of Vitamin D in children gives this?

Rickets

Signup and view all the flashcards

Length-wise central canals connect how?

Volkmann canals

Signup and view all the flashcards

Calcitonin in blood increases, Calcium?

In the blood decreases

Signup and view all the flashcards

High Calcium Diet impact on body?

Both B and C are correct

Signup and view all the flashcards

Which bone is within the tendon?

Sesamoid bone

Signup and view all the flashcards

Concentric layers of calcified matrix are called?

Lamellae

Signup and view all the flashcards

Small spaces in the matrix for bone cells?

Lacunae

Signup and view all the flashcards

Where can Diploë be found?

In the middle of spongy bone

Signup and view all the flashcards

Related Documents

More Like This

Fractures and Bone Healing - S2
49 questions
Types and Causes of Bone Fractures
16 questions
Bone Growth and Fractures
34 questions

Bone Growth and Fractures

EnviablePennywhistle6943 avatar
EnviablePennywhistle6943
Fractures and Bone Healing Quiz
22 questions
Use Quizgecko on...
Browser
Browser