Domanda del libro di testo
How does cardiac muscle tissue contract without neural stimulation?
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Ch. 10 Muscle Tissue
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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TOC.tableOfContents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 30
Bill broke his leg in a football game, and after six weeks the cast is finally removed. As he steps down from the examination table, he loses his balance and falls. Why?
Guida verificata passo dopo passo1
Step 1: Understand that when a limb is immobilized in a cast for an extended period, the muscles and sensory receptors in that limb undergo changes due to lack of use.
Step 2: Recognize that muscle atrophy occurs because the muscles are not contracting regularly, leading to weakness and reduced ability to support the body.
Step 3: Consider that proprioceptors, such as muscle spindles and joint receptors, which provide the brain with information about limb position and movement, become less sensitive or less effective after immobilization.
Step 4: Realize that the loss of proprioceptive feedback and muscle strength impairs balance and coordination, making it difficult for Bill to maintain stability when he first steps down from the table.
Step 5: Conclude that Bill's fall is due to a combination of muscle weakness and impaired proprioception following the period of immobilization in the cast.
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Proprioception
Proprioception is the body's ability to sense its position and movement in space through receptors in muscles and joints. After immobilization, such as wearing a cast, proprioceptive feedback can be diminished, leading to impaired balance and coordination.
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3:34
Somatosensory System
Muscle Atrophy and Weakness
Muscle atrophy refers to the loss of muscle mass and strength due to disuse, common after prolonged immobilization. Weak muscles around the injured leg reduce stability and control, increasing the risk of falls when weight-bearing resumes.
Video consigliato:
2:00Introduction to Muscles and Muscle Tissue Example 1
Neuromuscular Re-education
Neuromuscular re-education involves retraining the nervous system and muscles to work together effectively after injury or immobilization. Without proper rehabilitation, the coordination needed for balance may be compromised, causing instability when standing or walking.
Video consigliato:
5:56A. Events at the Neuromuscular Junction
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Linda's father suffers an apparent heart attack and is rushed to the emergency room of the local hospital. The doctor on call tells her that he has ordered some blood work and that he will be able to tell if her father actually had a heart attack by looking at the blood levels of CK and cardiac troponin. Why would knowing the level of CK and cardiac troponin help to indicate if a person suffered a heart attack?
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Domanda del libro di testo
For each portion of a myogram tracing a twitch in a stimulated calf muscle fiber, describe the events that occur within the muscle fiber.
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