MGTA02H3 Lecture Notes - Lecture 16: Clostridium Tetani, Depolarization, Oxidative Phosphorylation
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All muscles in our body are stimulated by nicotine: the binding causes an action potential which triggers muscles to contract. The basic units of the muscle are the muscle cell (fibre: these are very long and run the entire length of the muscle, they are multinucleated developed from multiple cells fusing together, macroscopic view: They are bound into these structures called fascicle which are groupings of fibres connected by connective tissue which are bound by more connective tissue which form the muscle as a whole: microscopic view: Actin and myosin (protein filaments) are grouped into myofibrils which collectively make up a single muscle fibre. Muscle contracts because the thin and thick (respectively) protein filaments slide across one another: skeletal muscle structure. Muscle fibres are multinucleated made up of thin actin filaments and thick myosin filaments (collectively known as myofibrils: the repeating pattern of actin and myosin filaments are known as a sarcomere (one contractile unit)
