MEDI111 Lecture Notes - Lecture 5: Loose Connective Tissue, Skeletal Muscle, Endoplasmic Reticulum
6 Aug 2018
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Document Summary
Three types of skeletal muscle: skeletal muscle, attached to bone and skin, striated (striped, voluntary (conscious control, powerful more fatigue-able, cardiac muscle, only in heart, striated (striped) In walls of hollow organs e. g. stomach, urinary tract, bladder, airways: not striated. Muscle functions: movement of bones or fluid (e. g. blood, maintain posture and body position, stabilise joints, generate heat (esp. skeletal muscle) Special characteristics of muscle tissue: excitability (responsiveness of irritability) ability to receive and response to stimuli, contractibility ability to shorten when stimulated, extensibility ability to be stretched, elasticity ability to recoil to resting length. Muscles attach: directly epimysium of muscle is fused to periosteum of bone or perichondrium of cartilage. Indirectly connective tissue wrappings extend beyond muscle as a ropelike tendom or sheetlike aponeurosis. Microscopic anatomy of a skeletal muscle fibre: cylindrical cell, up to 30cm long, extremely small diameter, multiple peripheral nuclei, many mitochondria, glycogen and myoglobin for oxygen storage, also contain myofibrils, sarcoplasmic reticulum and t tubules.
