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Skeletal Muscle

Basic Characteristics

What is the function of Skeletal Muscle? Movement and Stability of Skeleton
What is a Motor Unit/Muscle Fiber? collection of 10-2000 Cells innervated by branches of ONE Motor Nerve
When do Motor Units respond to a Stimulus? when Depolarized
What are Myofibrils? bundles of Myofilaments
What are Myofilaments? Contractile Proteins - Myosin, Actin
What are z-Lines? Protein anchoring discs for Actin
How does a Sarcomere shorten? Myosin over Actin
What are 4 characteristics of Skeletal Muscle? 1. resting Potential (like Neurons); 2. Voluntary, quick Contraction; 3. All-or-None contraction; 4. Biochemical Specialization
what is meant bu All-or-None Contraction? ALL Cells of a given Motor Unit contract FULLY, Simultaneously, or not at all
What are the 2 types of Biochemical Specialization? SLOW-Oxidative "Red" Fibers, FAST-Glycolytic "White" Fibers
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
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
Name 2 Glycolytic Enzymes. Pyruvic & Lactic Acids
Why do "White Fibers" have a lot of Glycogen? need because Anaerobic --> less ATP
How does exercise change or not change Skeletal Muscle? INCREASES Vascularity, Mitochondria, and amount of Myosin & Actin
Created by: Kristel