Ch. 6 Bones and Skeletal Tissues

Marieb - Human Anatomy & Physiology 7th Edition

Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook

Marieb, Hoehn 7th Edition

Ch. 6 Bones and Skeletal Tissues

Problem 9

Chapter 6, Problem 9

The disorder in which bones are porous and thin but bone composition is normal is
a. Osteomalacia
b. Osteoporosis
c. Paget's disease

Verified step by step guidance

Step 1: Understand the key characteristics of each disorder mentioned in the problem to differentiate them based on bone structure and composition.

Step 2: Osteomalacia is a condition where bones become soft due to defective bone mineralization, often caused by vitamin D deficiency, leading to abnormal bone composition.

Step 3: Osteoporosis is characterized by porous and thin bones, but the bone composition remains normal; the issue is a decrease in bone mass and density, not the quality of the bone material itself.

Step 4: Paget's disease involves abnormal bone remodeling, leading to enlarged and misshapen bones, which is different from simply having porous and thin bones with normal composition.

Step 5: Based on these distinctions, identify the disorder that matches the description of porous and thin bones with normal bone composition, which is the hallmark of osteoporosis.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Osteoporosis

Osteoporosis is a bone disorder characterized by porous and thin bones due to decreased bone density, while the bone composition remains normal. It leads to fragile bones and increased fracture risk, commonly affecting older adults, especially postmenopausal women.

Osteomalacia

Osteomalacia involves the softening of bones caused by defective bone mineralization, often due to vitamin D deficiency. Unlike osteoporosis, the bone matrix is abnormal, leading to weak and deformed bones rather than just reduced density.

Paget's Disease of Bone

Paget's disease is a chronic disorder where bone remodeling is disrupted, causing enlarged and misshapen bones. It involves excessive bone resorption followed by disorganized bone formation, differing from osteoporosis and osteomalacia in pathology and bone structure.

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Textbook Question

A bone with approximately the same width, length, and height is most likely:

a. A long bone

b. A short bone

c. A flat bone

d. An irregular bone

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Textbook Question

Wolff's law is concerned with:

a. Calcium homeostasis of the blood

b. The shape of a bone being determined by mechanical stresses placed on it

c. The electrical charge on bone surfaces

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Textbook Question

Osteocytes residing in lacunae of osteons of healthy compact bone are located quite a distance from the blood vessels in the central canals, yet they are well nourished. How can this be explained?

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Textbook Question

Bone remodeling in adults is regulated and directed mainly by:

a. Growth hormone

b. Thyroid hormones

c. Sex hormones

d. Mechanical stress

e. PTH

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Textbook Question

Describe in proper sequence the events of endochondral ossification in a long bone.

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