Type I Slow Oxidative Fibers, Type II Fast Glycolytic Fibers, Mitochondria, Myoglobin, Fatigue Resistance, Concentric, Eccentric, Isometric, Co-Contractions, Length-Tension Relationship, Passive Insufficiency, Muscle Detraining, Atrophy, Sarcopenia, Post-

Type I Slow Oxidative Fibers, Type II Fast Glycolytic Fibers, Mitochondria, Myoglobin, Fatigue Resistance, Concentric, Eccentric, Isometric, Co-Contractions, Length-Tension Relationship, Passive Insufficiency, Muscle Detraining, Atrophy, Sarcopenia, Post-Polio Syndrome, Schwann Cells, Neuropraxia, Axonotmesis, Neurotmesis, Wallerian Degeneration Exam Questions Provided with Complete and Verified A+ Graded Rationales LATEST UPDATED 2026 which muscle type uses oxidative metabolism? slow oxidative (type I) which muscle type uses glycolytic metabolism? fast glycolytic (type IIb) Type I muscle fibers slow oxidative ("slow twitch") - oxidative phosphorylation - lots of mitochondria & myoglobin - fatigue resistant = prolonged muscle activity Type I fiber metabolism oxidative phosphorylation which muscle fibers are used in prolonged muscle activity? type 1 ("slow oxidative" "fast twitch") Type II muscle fibers fast glycolytic ("fast twitch") - very little mitochondria & myoglobin - glycolysis metabolism - fast & powerful movements (ex: sprinting) which muscle fibers are used for fast powerful movements? type IIb ("fast twitch" "fast glycolytic") Type IIb fiber metabolism glycolysis which muscle fiber type has little mitochondria? type IIb ("fast twitch") which muscle fiber is recruited first? Type 1 ("slow twitch") - with the smallest ones being first Post-Polio Syndrome (PPS) increased weakness and/or abnormal muscle fatigue in persons who had paralytic polio many years earlier - with age we cannot keep up with the compensation in our muscles from the polio related muscle death = muscles lose innervation sarcopenia the loss of muscle mass, strength, and function that comes with aging - especially type II fibers concentric contraction muscle shortens (force load) isometric contraction muscle remains at fixed length (force = load) eccentric contraction muscle lengthens (force load) co-contraction when agonist and antagonist contract together & a joint must be stabilized **offe