Muscle Tissue

Muscle Tissue - Muscles and Muscle Tissue PART A Muscle...

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Muscles and Muscle Tissue P A R T A
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Muscle Overview ¡ The three types of muscle tissue are  skeletal, cardiac, and smooth ¡ Skeletal and smooth muscle cells are  elongated and are called muscle fibers ¡ Muscle contraction depends on two kinds  of myofilaments – actin and myosin
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Muscle Similarities ¡ Muscle terminology is similar l Sarcolemma  – muscle plasma  membrane l Sarcoplasm  – cytoplasm of a muscle  cell l Prefixes –  myo mys , and  sarco  all  refer to muscle
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Skeletal Muscle Tissue ¡ Packaged in skeletal muscles that attach to  and cover the bony skeleton ¡ It is  striated ¡ Is controlled  voluntarily   ¡ Contracts rapidly but tires easily ¡ Is responsible for all locomotion, posture, joint  stabilization and heat generation
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Cardiac Muscle Tissue ¡ Occurs only in the heart  ¡ Is  striated  like skeletal muscle but  involuntary ¡ Contracts at a fairly steady rate set by  the heart’s pacemaker
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Smooth Muscle Tissue ¡ Found in the walls of hollow visceral  organs ¡ Propels food and other substances  through organs ¡ It is  not striated  and  involuntary
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Functional Characteristics of Muscle Tissue ¡ Excitability, or irritability – the ability to  receive and respond to stimuli ¡ Contractility – the ability to shorten  forcibly ¡ Extensibility – the ability to be stretched  or extended ¡ Elasticity – the ability to recoil and  resume the original resting length
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Structure and Organization of Skeletal Muscle Table 9.1a
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Structure and Organization of Skeletal Muscle
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Skeletal Muscle ¡ Each muscle is a discrete organ  composed of muscle tissue, blood  vessels, nerve fibers, and connective  tissue
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Skeletal Muscle ¡ The three connective tissue sheaths are: l Endomysium  – fine sheath of connective  tissue surrounding each muscle fiber l Perimysium  – fibrous connective tissue  that surrounds groups of muscle fibers ¡ Fascicles
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Skeletal Muscle l Epimysium    ¡ A layer of fibrous connective tissue  that surrounds the entire muscle
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Skeletal Muscle Figure 9.2a
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Skeletal Muscle: Nerve and Blood Supply ¡ Each muscle is served by one nerve, an  artery, and one or more veins ¡ Each skeletal muscle fiber is supplied  with a nerve ending that controls  contraction ¡ Contracting fibers require continuous  delivery of oxygen and nutrients via  arteries ¡ Wastes must be removed via veins
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Skeletal Muscle: Attachments ¡ Most skeletal muscles span joints and  are attached to bone in at least two  places ¡ When muscles contract the movable  bone, the muscle’s insertion moves  toward the immovable bone, the muscle’s  origin
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Skeletal Muscle: Attachments ¡ Muscles attach: l Directly – epimysium of the muscle is 
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This note was uploaded on 01/06/2012 for the course BIOL 2401 taught by Professor Elainefanin during the Fall '11 term at Collins.

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Muscle Tissue - Muscles and Muscle Tissue PART A Muscle...

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