IPHY 3410 Lecture Notes - Lecture 6: Sliding Filament Theory, Skeletal Muscle, Myocyte
22 Sep 2016
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Document Summary
Explain attachments of muscles to bones through tendons, aponeuroses, and direct and indirect attachments. Muscle has been stretched beyond resting length: z discs pull then filaments away from each other leaving thick filament in the center exposed. Muscle is able to regain original shape: z discs come back together and thick and thin filaments overlap, titin plays a key role. Found within walls of most internal organs and walls of blood vessels. Generalized muscle cell: sarcolemma plasma membrane, sarcoplasm cytoplasm, nucleus, myofilaments thin actin filaments or thick myosin filaments. Aponeurosis = flat sheet: functional patterns & shapes of muscles, parallel (greatest shortening ability, weakest) Fascicles run parallel to axis of muscle with tendon on either end. Few fibers than other types of muscles of equivalent size not as strong. Longer fibers give ability to shorten the most: pennate (least shortening ability, strongest) Fascicles attach to tendon at an angle.
