Domanda del libro di testo
Compare bone to cartilage tissue relative to its resilience, speed of regeneration, and access to nutrients.
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Ch. 6 Bones and Skeletal Tissues
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
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TOC.tableOfContents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Non è quello che usi tu?Cambia libro di testo
Capitolo 6, Problema 17
Why do you think wheelchair-bound people with paralyzed lower limbs have thin, weak bones of the leg and thigh?
Guida verificata passo dopo passo1
Understand that bones require mechanical stress or weight-bearing activity to maintain their density and strength, a concept known as Wolff's Law.
Recognize that in wheelchair-bound individuals with paralyzed lower limbs, the legs and thighs do not experience normal weight-bearing forces due to lack of movement and muscle contractions.
Identify that the absence of mechanical stress leads to decreased stimulation of bone-forming cells (osteoblasts) and increased activity of bone-resorbing cells (osteoclasts), resulting in bone loss or osteoporosis.
Connect that this bone loss manifests as thinner, weaker bones in the legs and thighs because the skeletal system adapts to the reduced functional demand.
Conclude that maintaining bone strength requires regular mechanical loading, which is absent in paralyzed limbs, explaining the observed bone thinning and weakness.
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Bone Remodeling and Mechanical Stress
Bone remodeling is a continuous process where bone tissue is broken down and rebuilt. Mechanical stress from weight-bearing activities stimulates bone formation, maintaining bone density and strength. Without regular stress, bones lose mass and become weaker.
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4:19
Introduction to Bone Cells
Effects of Immobilization on Bone Health
Immobilization or lack of movement, such as in wheelchair-bound individuals, reduces mechanical loading on bones. This leads to decreased bone formation and increased bone resorption, causing bones to become thin, fragile, and prone to fractures.
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Percorso guidato
1:32Effects of the Complement System
Impact of Paralysis on Musculoskeletal System
Paralysis of lower limbs results in muscle atrophy and reduced stimulation of bones due to inactivity. The lack of muscle contractions and weight-bearing activities diminishes bone strength and density, contributing to weaker bones in the legs and thighs.
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Percorso guidato
4:25Complement System
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Compare and contrast controls of bone remodeling exerted by hormones and by mechanical and gravitational forces, including the purpose of each control system and changes in bone architecture that might occur.
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Domanda del libro di testo
(a) During what period of life does skeletal mass increase dramatically? Begin to decline?
(b) Why are fractures most common in elderly individuals?
(c) Why are greenstick fractures most common in children?
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Domanda del libro di testo
Describe the process of new bone formation in an adult bone. Use the terms "osteoid seam" and "calcification front" in your discussion.
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Domanda del libro di testo
Mrs. Abbruzzo brought her 4-year-old daughter to the doctor, complaining that she didn't 'look right.' The child's forehead was enlarged, her rib cage was knobby, and her lower limbs were bent and deformed. X rays revealed very thick epiphyseal plates. Mrs. Abbruzzo was advised to increase dietary amounts of vitamin D and milk and to get the girl outside to play in the sun. Considering the child's signs and symptoms, what disease do you think she has? Explain the doctor's instructions.
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Domanda del libro di testo
Yolanda is asked to review a bone slide that her professor has set up under the microscope. She sees concentric layers surrounding a central cavity. Is this bone section taken from the diaphysis or the epiphyseal plate of the specimen?
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