Some skeletal muscle fibers are “fast-twitch” fibers (white fibers), and others are “slow-twitch” (red) fibers. Would you expect an athlete proficient in running the 100-yard dash to have a greater proportion of red fibers or white fibers in muscles of the leg? Why?
Some skeletal muscle fibers are “fast-twitch” fibers (white fibers), and others are “slow-twitch” (red) fibers. Would you expect an athlete proficient in running the 100-yard dash to have a greater proportion of red fibers or white fibers in muscles of the leg? Why?
Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter8: Muscle Physiology
Section: Chapter Questions
Problem 2TAHL
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Muscle Physiology
- Some skeletal muscle fibers are “fast-twitch” fibers (white fibers), and others are “slow-twitch” (red) fibers. Would you expect an athlete proficient in running the 100-yard dash to have a greater proportion of red fibers or white fibers in muscles of the leg? Why?
- Define the following:
- Maximal stimulus
- Threshold stimulus
- Submaximal stimulus
- A skeletal muscle can be stimulated, under laboratory conditions, with a supramaximal stimulus. Is it possible for the muscle to respond with a supramaximal contraction? Explain
- Define a motor unit. Of what physiological advantage is a small motor unit arrangement in skeletal muscle?
- Explain why a latent period is observed between the application of a stimulus and contraction of the stimulated muscle.
- Explain, giving two causative factors, why skeletal muscle displays fatigue.
- Does complete or incomplete tetanus occur physiologically? Explain.
- Define the following:
- Isometric contraction
- Isotonic contraction
- Optimum length (load)
- Define the following:
- Electromyography
- Dynamometry
- What does the term motor unit recruitment mean?
- Are you right-handed, left-handed, or ambidextrous? Which hand took the longest time to fatigue? Explain.
- Define the following:
- Muscle tonus
- Spastic paralysis
- Flaccid paralysis
- Poliomyelitis affects the anterior horn of the spinal gray matter. Would you expect the polio patient to exhibit spastic or flaccid paralysis? Why?
- Is the brain necessary for spinal reflex activity to occur? Why or why not?
- List in correct sequence the major components of a spinal reflex arc.
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