UGA CBIO 2200 - CBIO2200 Exam 4 (13 pages)

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CBIO2200 Exam 4



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CBIO2200 Exam 4

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Pages:
13
School:
University of Georgia
Course:
Cbio 2200 - Anat & Physiol I
Anat & Physiol I Documents

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11 2 14 6 03 PM Characteristics of Muscle Responsiveness Excitability To chemical signals stretch and electrical changes across the plasma membrane Conductivity Local electrical charge triggers a wave of excitation that travels along the muscle fiber Contractility Shortens when stimulated Extensibility Capable of being stretched between contractions Elasticity Returns to its original resting length after being stretched Structure of Muscle Fiber Epimysium Connective tissue that covers entire muscle Perimysium Connective tissue around muscle fasciles o Fasciles Surrounded by perimysium Endomysium Connective tissue around muscle cells o Continuous with collagen fibers of tendons and connective tissue of bone matrix o Collagen Somewhat extensible and elastic stretches slightly under tension and recoils when released Resists excessive stretching and protects muscle from injury Returns muscle to its resting length Contribute to power output and muscle efficiency Muscle Fibers Cells Surrounded by endomysium Myofibrils Myofilaments Thick and thin filaments Skeletal Muscle Voluntary striated muscle attached to one or more bones Multinucleated Striated Alternating light and dark transverse bands as a result of overlapping of internal contractile proteins Voluntary Usually subject to conscious control Muscle Fiber Muscle Cell Sarcolemma Plasma membrane of muscle cell Sarcoplasm Cytoplasm of a muscle fiber Myofibrils Long protein bundles that occupy the main portion of the sarcoplasm o Glycogen Storage form of glucose in abundance to provide energy with heightened exercise Ready for action o Myoglobin Red pigment that carries oxygen needed for muscle activity Equivalent of hemoglobin in muscle cells Multiple Nuclei Flattened nuclei pressed against the inside of the sarcolemma o Myoblasts Stem cells that fuse together to form each muscle fiber o Satellite Cells Unspecialized myoblasts remaining between the muscle fiber and endomysium that are important for muscle repair May



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