Download Sliding Filament Theory

SLIDING FILAMENT THEORY
MUSCLE BREAKDOWN ANATOMY
• EPIMYSIUM: COVERS ENTIRE MUSCLE, MADE OF THOUSANDS OF
MUSCLE CELLS
• PERIMYSIUM: SURROUNDS THE FASCICLE
• FASCICLE: MUSCLE FIBER GROUPS, ABOUT 150 FIBERS
• MUSCLE FIBERS: LONG, CYLINDRICAL CELLS ABOUT THE SIZE OF HAIR
• ENDOMYSIUM: SURROUNDS INDIVIDUAL MUSCLE FIBER
• MYOFIBRIL: WITHIN EACH FASCICLE, CONTAINS THOUSANDS CELLS,
MAKES MUSCLE CONTRACTION
REVIEW: TALK ABOUT EACH PART WITH A NEIGHBOR
MORE MUSCLE FIBER BREAK DOWN
• SARCOMERE: CONTRACTILE ELEMENT.
BANDS OF MYOFIBRILS ALIGNED.
SARCOMERE BREAK DOWN
• MYOFILAMENTS:
• THICK = CONTAIN BUNDLED MYOSIN
MOLECULES
• THIN = ACTIN MOLECULES
• THE SLIDING OF ACTIN PAST THE MYOSIN
PRODUCES MUSCLE SHORTENING
MYOFILAMENT CONTRACTION:
WATCH VIDEO THEN TAKE QUIZ AS A CLASS
• HTTP://HIGHERED.MCGRAWHILL.COM/SITES/0072495855/STUDENT_VIEW0/CHAPTER10/ANIMATION__MYOFILAMENT_C
ONTRACTION.HTML
SLIDING FILAMENT THEORY:
HOW MUSCLE CONTRACT
• HTTP://HIGHERED.MCGRAWHILL.COM/OLCWEB/CGI/PLUGINPOP.CGI?IT=SWF::535::535::/SITES/DL/FREE/0072437316/1
20104/BIO_B.SWF::SARCOMERE SHORTENING
MUSCLE CONTRACTION BASICS:
ALL OR NOTHING PRINCIPLE
motor
____________________NEURONS
Muscle fibers
EXCITES _______________________
Acetycholine
RELEASES
(a neurotransmitter)
_________________________
A muscle contraction
sarcolema
EXCITES ______________________
RESULTS IN ___________________________________________