Basic Characteristics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What is the function of Skeletal Muscle? | Movement and Stability of Skeleton
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| What is a Motor Unit/Muscle Fiber? | collection of 10-2000 Cells innervated by branches of ONE Motor Nerve
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| When do Motor Units respond to a Stimulus? | when Depolarized
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| What are Myofibrils? | bundles of Myofilaments
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| What are Myofilaments? | Contractile Proteins - Myosin, Actin
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| What are z-Lines? | Protein anchoring discs for Actin
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| How does a Sarcomere shorten? | Myosin over Actin
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| What are 4 characteristics of Skeletal Muscle? | 1. resting Potential (like Neurons); 2. Voluntary, quick Contraction; 3. All-or-None contraction; 4. Biochemical Specialization
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| what is meant bu All-or-None Contraction? | ALL Cells of a given Motor Unit contract FULLY, Simultaneously, or not at all
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| What are the 2 types of Biochemical Specialization? | SLOW-Oxidative "Red" Fibers, FAST-Glycolytic "White" Fibers
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| What are some characteristics of SLOW-Oxidative Fibers? | 1. slow, Sustained contractions; 2. HIGH Myoglobin; 3. MANY Mitochondria, LITTLE Glycogen; 4. NUMEROUS Capillaries; 5. SMALL Motor Units; 6. DIFFICULT to Fatigue
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| What are some characteristics of FAST-Glycolytic Fibers? | quick, Brief contractions; 2. LITTLE Myoglobin; 3. FEW Mitochondria, LOTS Glycolytic Enzymes; 4. FEW Capillaries; 5. HUGE SR; 6. HIGH Glycogen; 7. LARGE Motor Unit; 8 .LARGE Diameter; 9. EASILY Fatigued
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| Name 2 Glycolytic Enzymes. | Pyruvic & Lactic Acids
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| Why do "White Fibers" have a lot of Glycogen? | need because Anaerobic --> less ATP
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| How does exercise change or not change Skeletal Muscle? | INCREASES Vascularity, Mitochondria, and amount of Myosin & Actin
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Created by:
Kristel
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