KINE 1020 Lecture 32: Lecture 32, November 30th
5 Dec 2016
School
Department
Course
Professor
Document Summary
Types of contractions and sarcomere organization: the actin slides over the myosin, but neither of them change in their length. In isometric contraction, the i bands don"t change. In a shortening contraction, the i bands (light bands) get shorter. In eccentric contraction, the i bands get thicker, because the actin is sliding back into position after it has contracted. Sarcomere - proteins actin is a long twisted lament, made of something called g actin f actin is a long lament of stacked g actin monomers: actin: g-actin monomers, f-actin laments. Troponin is the site of calcium binding troponin pulls tropomyosin back tropomyosin rolls back on the actin the myosin binding site on actin is exposed and the myosin binds. Myosin is made of a long, thick core, with many ,myosin heads coming out extending from myosin tails. when the troponin pulls the tropomyosin away, the myosin is attracted to the actin.
