PHGY 214 Lecture Notes - Lecture 18: Cytoskeleton, Motor Neuron, Tetanospasmin
8 Dec 2017
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Developing tension (force: depends on initial length of sarcomere prior to contraction if too long not enough cross-bridges if too short thin/thick filaments overlap. Resting length i n o s n e t length resting length is usually equal to optimal length (greatest tension development) Muscle tension total tension is the sum of active and passive tension: active tension = from actin and myosin interaction, passive tension =from stretching elastic components active passive i n o s n e t length. Developing tension muscle twitch = one contraction/relaxation response to a single ap in a. 100 msec for contraction + relaxation: contraction/tension lasts longer than action potential time. Skeletal muscle attachments: origin attachment is insertion attachment is more distal or mobile point closest to trunk flexors. Bring bones brings bone closer together: extensors. Move bones brings bones farther apart tendons attach muscle fascicles to bones.
