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Muscle Structure and Function - Zoology - Lecture Notes

Lecture Notes, Zoology

Post: December 23th, 2012
Description
Muscle Structure and Function, Types of Muscle Tissue, Structure of Skeletal Muscle, Hierarchy of Structure, Bundle of Muscle Fibers, Bundles of Contractile Proteins, Sarcomere are some points from this lecture. This lecture is one of lectures on Zoology.
Muscle Structure and Function, Types of Muscle Tissue, Structure of Skeletal Muscle, Hierarchy of Structure, Bundle of Muscle Fibers, Bundles of Contractile Proteins, Sarcomere are some points from this lecture. This lecture is one of lectures on Zoology.
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Contents
Mu scle Structure and Function A. Types of Muscle Tissue 1. skeletal muscle - striated, voluntary 2. cardiac muscle - striated, involuntary 3. smooth muscle - non-striated, involuntary B. Structure of Skeletal Muscle 1. Hierarchy of structure: whole muscle fascicle = bundle of muscle fibers muscle fiber = cell (multinucleated) myofibril - subcellular bundles of contractile proteins; striations myofilaments - thick filaments and thin filaments sarcomere - structural/functional unit of muscle contraction - organized array of myofilaments, repeated in series along myofibrils C. The Sarcomere A band I band Z line (Z disc) H zone thick filaments: myosin thin filaments: actin tropomyosin troponin D. Sliding Filament Mechanism 1. Changes in the sarcomere during contraction • A band stays the same • I band and H zone become narrower • Z lines move closer together 2. Muscle contraction cycle: 1.cross bridge - myosin head binds to actin 2.power stroke - myosin head rotates and pulls thin ..

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