BIOL 155 Lecture Notes - Lecture 9: Sliding Filament Theory, Endoplasmic Reticulum, Myocyte
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Ubc biol 155 lecture 8 notes muscular system. Describe the microscopic structure of a striated muscle fiber. Describe the functional roles of myofibrils, sarcoplasmic reticulum and t-tubules. Give a detailed description of the sliding filament theory of muscle contraction. Explain the events leading from the arrival of neurotransmitter at the endplate of a neuromuscular junction, through contraction and on to relaxation of a muscle fiber. Explain why thick and thin filaments do not slip backwards during muscle fiber contraction when the cross-bridges break and reform between the actin and myosin molecules. Define muscle twitch and describe the events which occur during its three phases. Given that action potentials in nerves and muscles are all-or-none events, explain how smooth graded contractions of muscles are produced. Describe the sources of atp used during muscle contraction. List and describe the features which affect the force and speed of contraction of a muscle fiber. List the different types of muscles and their characteristics.
