lecture 35 lecture - Lecture 35: Movement and Motor Control...

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Lecture 35: Movement and Motor Control 1- skeletons 2- muscle structure 3- sliding filament model 4- excitation – contraction coupling 5- reflexive coordination 6- energetics 3 Types of Skeleton 1) Hydrostatic : body cavity is kept under pressure by antagonistic circular & longitudinal muscles (worms, insect larvae, some mollusks) 2) External (Exoskeleton): cuticle is a flexible membrane at joints. Antagonistic muscles span the joint and attach to stiff cuticle (arthropods, most mollusks, brachiopods) 3) Internal (Endoskeleton): flexible joints are held together by proteinaceous ligaments. Antagonistic muscles span the joint and attach to stiff plates or bones (deuterostomes (echinoderms and chordates)) 3 Types of Muscle in Vertebrates 1) Skeletal or striated 2) Cardiac or <3 Muscle 3) Visceral or Smooth Striated Muscle: Cell (fiber, synctium) Myofibril (many per cell) Thin (actin) and thick (myosin) filaments -myosin and actin ratchet past each other as muscle fibers contract 2 Regualtory Proteins and Ca2+ control muscle fiber contraction -Ca2+ is sotred in the sarcoplasmic reticulum -release triggered by arrival of action potential via transverse tubules (T-tubules)
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This note was uploaded on 03/03/2010 for the course BIOG 1101 taught by Professor N/a during the Fall '10 term at Cornell University (Engineering School).

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lecture 35 lecture - Lecture 35: Movement and Motor Control...

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