Biology Chapter 7: Skeletal System
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Questions and Answers

Which of the following is NOT a function of the skeletal system?

  • Assists in mineral homeostasis
  • Protects internal organs
  • Supports the body
  • Regulates blood sugar (correct)

The periosteum is the outer covering of bones where tendons and ligaments attach.

True (A)

What is the study of bone structure called?

osteology

Bone is made of bone tissue, __________ cartilage, dense connective tissue, and other tissues.

<p>hyaline</p> Signup and view all the answers

Which mineral salt is primarily responsible for the hardness of bone tissue?

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

Match the following types of cells in bone with their functions:

<p>Osteoprogenitor cells = Stem cells of bone Osteoblasts = Bone formation Osteocytes = Maintenance of bone tissue Osteoclasts = Bone resorption</p> Signup and view all the answers

What is the function of the medullary cavity in long bones?

<p>Stores yellow bone marrow and blood vessels</p> Signup and view all the answers

The process of __________ refers to the hardening of bone tissue due to mineral deposits.

<p>calcification</p> Signup and view all the answers

What role does calcium play in the body?

<p>Aids in nerve and muscle cell function (B)</p> Signup and view all the answers

A sedentary lifestyle increases bone density.

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

What is the term for the process of aligning broken bones for healing?

<p>reduction</p> Signup and view all the answers

The distal portion of the femur is remodeled every ____ months.

<p>4</p> Signup and view all the answers

Match the types of fractures to their descriptions:

<p>Stress fractures = Microscopic breaks that may not damage surrounding tissues Compound fractures = Large breaks that damage surrounding tissues Closed reductions = Do not require surgical intervention Open reductions = Involve surgical intervention to realign bones</p> Signup and view all the answers

Which type of exercise is most beneficial for bone health?

<p>Weight-bearing exercise (C)</p> Signup and view all the answers

Osteoporosis disproportionately affects elderly women due to higher estrogen levels.

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

What triggers the release of parathyroid hormone?

<p>lower concentration of ca2+</p> Signup and view all the answers

A fracture hematoma is formed during the reactive phase of bone repair to stop ______ from the broken blood vessels.

<p>bleeding</p> Signup and view all the answers

What is a common treatment for osteoporosis?

<p>Increased vitamin D intake (A), Weight-bearing exercises (B)</p> Signup and view all the answers

What type of bone cell primarily secretes collagen?

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

Osteocytes can divide and secrete substances.

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

What is the process of bone formation called?

<p>ossification</p> Signup and view all the answers

The structural unit of compact bone is the __________.

<p>osteon</p> Signup and view all the answers

Match the following bone cells with their primary function:

<p>Osteoblasts = Secrete collagen and bone matrix Osteoclasts = Resorb bone tissue Osteocytes = Maintain bone tissue Chondrocytes = Maintain cartilage tissue</p> Signup and view all the answers

Which of the following statements about spongy bone is true?

<p>Spongy bone is lighter than compact bone. (C)</p> Signup and view all the answers

Trabeculae are the structural units of spongy bone tissue.

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

What do osteoclasts do?

<p>Catabolize bone</p> Signup and view all the answers

Osteocytes occupy spaces in the ECM called __________.

<p>lacunae</p> Signup and view all the answers

What nutrient delivery system supplies essential nutrients to bone cells?

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

The circular rings of ECM surrounding osteons are called concentric lamellae.

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

What are interstitial lamellae made of?

<p>Old concentric lamellae</p> Signup and view all the answers

Ossification proceeds through two main patterns: intramembranous and __________ ossification.

<p>endochondral</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Perforating fibers = Connects periosteum to bone Nutrient foramen = Entrance for nutrient arteries Red bone marrow = Site of blood stem cells Medullary cavity = Hollow center of long bones</p> Signup and view all the answers

What is the first step in the process of endochondral ossification?

<p>Mesenchymal cells differentiate into chondroblasts (A)</p> Signup and view all the answers

The periosteum is formed from mesenchymal tissue surrounding compact bone.

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

What remains at the joint surfaces of long bones after endochondral ossification?

<p>articular cartilage</p> Signup and view all the answers

The primary ossification center is located in the _______ of long bones.

<p>diaphysis</p> Signup and view all the answers

Match the zones of the epiphyseal plate with their descriptions:

<p>Zone of resting cartilage = Anchors the epiphyseal plate to bone Zone of proliferating cartilage = Site of actively dividing chondrocytes Zone of hypertrophic cartilage = Contains mature chondrocytes arranged in columns Zone of calcified cartilage = Contains layers of dead chondrocytes</p> Signup and view all the answers

What factor is NOT mentioned as affecting bone growth?

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

Appositional growth refers to the growth in the length of the bones.

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

What is the purpose of osteoclasts during bone remodeling?

<p>bone resorption</p> Signup and view all the answers

The process by which bones grow in circumference is known as _______ growth.

<p>appositional</p> Signup and view all the answers

Which zone of the epiphyseal plate contains large cells arranged in columns?

<p>Zone of hypertrophic cartilage (A)</p> Signup and view all the answers

Bone remodeling is a dynamic, lifelong process.

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

What is the consequence of the epiphyseal plate closing?

<p>Bone growth in length stops</p> Signup and view all the answers

Osteoblasts are responsible for ________ bone.

<p>building</p> Signup and view all the answers

Match the types of ossification with their characteristics:

<p>Intramembranous ossification = Bone forms directly from mesenchymal tissue Endochondral ossification = Bone forms from a pre-existing cartilage model Bone remodeling = Dynamic process of bone resorption and deposition</p> Signup and view all the answers

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