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Anat, Ch. 10 Notes

by: Jamesia Arnold

Anat, Ch. 10 Notes BIOL 2010

Marketplace > U of M > Biology > BIOL 2010 > Anat Ch 10 Notes
Jamesia Arnold
U of M
GPA 3.066

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Human Anatomy and Physiology I
Mr. Parris
Class Notes
Anatomy& Physiology
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This 3 page Class Notes was uploaded by Jamesia Arnold on Thursday March 17, 2016. The Class Notes belongs to BIOL 2010 at U of M taught by Mr. Parris in Fall 2016. Since its upload, it has received 29 views. For similar materials see Human Anatomy and Physiology I in Biology at U of M.


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Date Created: 03/17/16
Ch. 10 Muscular Tissue Myology: scientific study of muscle  Muscular tissue contributes to homeostasis producing motion results from the alternating contraction & relaxation of muscles, make up 40-50% of total adult body weight.  Types of tissue: 1) skeletal 2) cardiac 3) smooth Functions of tissue: Producing body movements stabilize body positions Storing & moving substances within body Generating heat Properties: Electrical excitability Contractility Extensibility Elasticity  Your skeletal muscles is a separate organ composed of hundreds and thousands of cells, Muscle Fibers - Also contains connective tissues surrounding muscle fiber & whole muscles, and blood vessels & nerves Connective Tissue Components: Connective tissue surrounds & protects muscular tissue. - Subcutaneous layer separates muscle from skin and is composed of areolar connective tissue & adipose tissue Fascia: A dense sheet or broad band of irregular connective tissue that lines body wall & limbs, supports & surrounds muscles and other organs Layers of connective tissue extended from the fascia: Perimysium Endomysium Epimysium  An artery and one or more veins accompany each nerve that penetrates a skeletal muscle.  Most important components of a skeletal muscle are muscle fibers.  Myofibrils are built from 3 kinds of proteins which are contractile, regulatory, and structural -Myosin: main important of thick filaments & functions as a motor protein in all three types of muscle tissue. -Actin: contractile protein that is part of thin filaments in muscle fibers Regulatory proteins: Tropomyosin Troponin Structural proteins: Titin a-Actinin Myomesin Nebulin Dystrophin Contraction Cycle: ATP hydrolysis Attachment of myosin to actin to form cross bridges Power stroke Detachmnet of myosin from actin Neuromuscular junction:  Neurons that stimulate skeletal muscle fibers to contract- Somatic motor neurons  Muscle action potential s arise at the neuromuscular junction Twitch Contraction: brief contraction of all muscle fibers in a motor unit in response to a single action potential in its motor neuron. Types of Skeletal muscle Fibers: Slow Oxidative Fiber Fast Oxidative-glycolytic Fiber Fast Glycolytic Fiber


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