BIO 212- Final Exam Guide - Comprehensive Notes for the exam ( 52 pages long!)

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This theory describes how during contraction two ends of a sarcomere come closer and the thin filaments slide past the thick ones so actin and myosin overlap more often. Actin is a thin strand while myosin is a thick strand. The sarcomere has microfilaments that contain these strands. The z-line separates each sarcomere from one another and contracts when muscles contract. Actin is blocked by tropomyosin and troponin; they both act as a bodyguards and prevent actin and myosin from bonding to each other. Atp and calcium ions stops tropomyosin and troponin from blocking the bonding of actin and myosin. The sarcoplasmic reticulum is a site that contains atp to build calcium ions. Calcium channels cause sodium channels to open after they open. When the actin potential reaches t-tubules, it gets to a sarcomere. Troponin loves to bind to calcium and changes its shape.