Questions and Answers
What is disuse atrophy?
Disuse atrophy is when something does not or cannot use a muscle.
What are some effects of atrophy?
Atrophy increases type I fibers and decreases type II fibers.
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What is a characteristic of myofiber size in disuse atrophy?
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How do age factors affect motor neurons?
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What happens to disconnected myofibers with age?
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Study Notes
Disuse Atrophy
- Occurs when a muscle cannot be used, leading to decreased strength and size.
Atrophy Overview
- Characterized by loss of cell proteins and organelles, essential for muscle function.
- Involves the shrinkage of myofibers and overall muscle belly.
- Often results from immobilization, limiting muscle activity.
- Leads to a shift in muscle fiber composition: an increase in type II fibers and a decrease in type I fibers.
Myofiber Patterns
- Disuse atrophy presents a variable size of myofibers, indicating inconsistent muscle loss.
- De-innervation causes patchy myofiber shrinkage, as multiple muscle fibers are innervated by a single motor neuron.
Age-Related Changes
- Aging impacts motor neurons, causing them to disconnect from some myofibers.
- Results in issues such as poor posture, weakness, and balance difficulties.
- Atrophied myofibers that are disconnected fail to regenerate, while those still connected retain some regenerative capacity.
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Description
This quiz focuses on the concept of atrophy, particularly disuse atrophy. You'll explore key definitions, effects on muscle fibers, and the implications of muscle disuse. Perfect for students and professionals in health and fitness fields.
