BIO 3303 Lecture Notes - Lecture 15: Big Area, The Nerves, Stomach

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Compare and contrast skeletal and cardiac muscle. Flat big area, you dont shorten very much bt you have forceproduction. There are two types of myocytes: skeletal muscle (myofibre) - multi, cardiac muscle (cardiomyocyte)-uni. The number of myofibrils in the bicep is different in the quads. There needs o be a mechanism to unattatch at. Muscles shortening are always active, they shorten certain points when the muscle is not excited. when ca2 is present. Tropomyosin will block the binding sites on is by passive means. When the mucles stops actin contracting, it will stay hosrt until we reliz it this is why e tropoinin copelx allows the actinand myosin we have opposing muscles. to start ratching. When ca gloods in and the tc (one of the 3 subunits) will undergo a conformational change to allow myosin to bind: ca2+ in, tropomyson moves, allows acitn myosin binding. Whe mucles are relaxed then need something to lengthen back out.

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