BIOS 252 UNIT 8 FINAL EXAM STUDY GUIDE | LATEST GUIDE

BIOS 252 UNIT 8 FINAL EXAM STUDY GUIDEBIOS 252 UNIT 8 FINAL EXAM STUDY GUIDE STUDY GUIDE BIO 252 FINAL EXAM Chapter 10: A. Muscle tissue function Produce body movements Stabilized body positions Storing and moving substances Generates heat B. Types of skeletal muscle proteins/function (p.300) Contractile Proteins ( generates force during contraction) Myosin: Makes up the thick filaments, consist of a tail and two myosin heads which binds to myosin binding site on acting molecule during contraction. Actin: Protein that is the main component of thin filament, each actin molecule has myosin –binding site, where myosis head of thick filament binds during contraction Regulatory Proteins (help switch muscle contraction on and off) Troponin. Component of thin filament, when calcium ions binds to troponin, it changes shape, this change moves tropomyosin away from myosin-binding on actin molecules Tropomyosin; Component of thin filament, when skeleton muscle fiber relaxed, tropomyosin covers myosin binding sites on actin molecules, preventing myosin from binding to actin. Structural Proteins; Keep thin and thick filaments of myofibrils in proper alignment Titin;Structure protein that connects z discs to M line of sarcomere helping to stabilize thick filaments positions, can stretch and spring back unharmed Dystrophin; Connects to the membrane protein Chapter 11: A. Steps in skeletal muscle contraction 1. Calcium binds to troponin, rotating tromyosin off the active site on actinng 2. Cross bridging occurs between the active site on the actin and myosin head.