When training for a marathon, some muscle fibers will switch from being fast glycolytic to slow oxidative. If we could biopsy the muscles before and after training and do a histological study, we would find that after training there were more fibers with Type I Myosin ATPas there were fewer fibers with a high concentration of succinate dehydrogenase there were more fibers with Type II myosin ATPase there were fewer fibers with a high concentration of mitochondria
When training for a marathon, some muscle fibers will switch from being fast glycolytic to slow oxidative. If we could biopsy the muscles before and after training and do a histological study, we would find that after training there were more fibers with Type I Myosin ATPas there were fewer fibers with a high concentration of succinate dehydrogenase there were more fibers with Type II myosin ATPase there were fewer fibers with a high concentration of mitochondria
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:When training for a marathon, some muscle fibers will switch from
being fast glycolytic to slow oxidative. If we could biopsy the muscles
before and after training and do a histological study, we would find
that after training
there were more fibers with Type I Myosin ATPas
there were fewer fibers with a high concentration of succinate
dehydrogenase
there were more fibers with Type II myosin ATPase
there were fewer fibers with a high concentration of mitochondria
Expert Solution
Step 1
Option 1 is the answer.
Type1 myosin fibres are effective for long periods of time.They undergoes slow oxidative respiration.
Type 2 myosin fibres are effective for short and rapid muscle contractions,they undergoes anerobic respiration.
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