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BIOL 273 (56)
Midterm

Chapter 12 textbook material to midterm only chapter 12 to midterm only

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Department
Biology
Course
BIOL 273
Professor
Katherine Wood
Semester
Winter

Description
Unit 3Muscle Chapter 12 Muscles SKELETAL MUSCLEPair of antagonistic muscles in arm o Biceps brachii frontflexormoves dumbbell toward shoulder o Triceps brachii backextensorlower dumbbell weightOne muscle contracts and shortens and the antagonistic muscle lengthens Skeletal Muscles Are Composed of Muscle Fibers Myofibrils Are the Contractile Structures of a Muscle FibreMyosinmotor protein with ability to create movement o Various formsDetermine muscles speed of contraction o Made up of a tail and a head with a hinge to allow then to swivel around their point of attachment250 myosin molecules join in skeletal musclethick filament o Arranged for myosin heads cluster at one end o Central region of filament is the bundle of myosin tailsActinprotein that makes up the thin filaments of muscle fibre o One actin molecule is a globular protein G
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