•Muscle Physiology (Ch. 8)•Types•Skeletal muscle structure•Sliding filament & Power stroke•Excitation – contraction couplingVertebrate PhysiologySept. 30, 2019•Paper topics due Today
Extra Credit Opportunity for Exam 1:•Attend one of the seminars listed below (Monday Sep. 30 or Monday Oct. 7, 3:30pm in LSA 101 Auditorium) •Write a 1 page summary of the talk, things you learned, etc.•Email it to me by Wed. of the same week (Oct. 2 or Oct. 9)Sept. 30: “Molecular Mechanisms Underlying Arteriovenous Malformations in Hereditary Hemorrhagic Telangiectasia (HHT)”Stryder Meadows, Tulane University. Oct. 7:“Regulatory Mechanisms Underlying Apical Constriction During Tubular Organ Formation”Thao Le, LSU Department of Biological Sciences.
Muscle PhysiologyMuscular system:•Comprises largest group of tissues in the bodySartorius muscle (thigh)Smallest muscle in body?Stapedius muscle (~1mm long) (middle ear)Longest muscle in body?
3 types of muscleSmoothCardiacSkeletal
Muscles TypesCategorized according to control and structure:•Control:Voluntary – skeletalInvoluntary – cardiac, smooth•Structure:Striated – skeletal, cardiacUnstriated – smooth
Skeletal Muscle Structure•Consists of muscle fibers lying parallel to one another, held together by connective tissue•Single skeletal muscle cell is a muscle fiber•multinucleated •large, elongated, and cylindrically shaped•fibers extend entire length of musclemuscleMuscle fiber
Myofibril•Muscle fibers are composed of myofibrils•Each myofibril made of regular arrangement of thick and thin filaments:•Thick filaments– myosin protein•Thin filaments– actin proteinmyofibril