Muscles & Motion.

Slides:

Advertisements

Similar presentations

Muscle Contraction.

Advertisements

Muscle Physiology Chapter 11. Connective Tissue Components Muscle cell = muscle fiber Endomysium – covers muscle fiber Perimysium – binds groups of muscle.

Neuromuscular Junction

Muscle Physiology Chapter 1.

Muscle Function.

Skeletal Muscle Contraction

Unit V: Movement Muscle Contraction - Part I

Muscular system SKELETAL MUSCLE Skeletal muscle is made up of hundreds of muscle fibers –Fibers consists of threadlike myofibrils –Myofibrils composed.

Anatomy and Physiology I

Sliding Filament Mechanism

Figure  _________ and_______filaments slide over each other______________the muscle length  Always requires ________ ions and ___.

Histology of Muscle.

Muscle Bundle = group of muscle fibers (muscle cells) that function together and are bound together by fascia (connective tissue). Examples: biceps brachii,

Skeletal Muscles. Anatomy and innervation of skeletal muscle tissue Connective tissue components: –Fascia (“bandage”) –sheet or band of fibrous C.T. under.

Motor mechanisms. Keywords (reading p ) Bundle, fiber, myofibril, sarcomere Z-line, thick filament, thin filament Actin, myosin, sliding filament.

Muscle Structure and Function

The Muscular System What do skeletal muscles do? How do muscles work?

Skeletal Muscle Key words:. Overview of the Muscle Fiber Structure Muscle fibers (cells) are composed of myofibrils Myofibrils are composed of myofilaments.

Muscle Contraction Tendon – cord of dense fibrous tissue attaching the muscle to a bone. Epimysium – the sheath of fibrous connective tissues surrounding.

Muscle Contraction. Muscle Movement Muscle fiber must be stimulated: – By an electrical signal called muscle action potential (AP) – Delivered by motor.

Muscle Cells & Muscle Fiber Contractions

Muscles & Skeleton Locomotion Chapter 50. Muscle structure  Muscle fibers  Single cell with many nuclei  Each fiber has a bundle of myofibrils  Each.

The Muscular System Skeletal muscle consists of numerous muscle cells called Muscle fibers. Muscle fiber terminology and characteristics Sarcolemma = plasma.

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Muscle Contraction.

Muscles. Muscles work by contracting. Muscles pull. A pair is needed to move a bone two ways. An antagonistic pair.

1 Structure of Skeletal Muscle We will begin our look at the structure of muscle starting with the largest structures and working our way down to the smallest.

Muscles. Smooth muscle Found in the walls of hollow organs and the blood vessels Lack striations Contain less myosin Cannot generate as much tension as.

Motor mechanisms.

Chapter 11 Physiology of the Muscular System. Introduction Muscular system is responsible for moving the framework of the body In addition to movement,

Chapter 38: Protection, Support, Movement: Skin, Skeleton, and Muscle.

Sensory and Motor Mechanisms – chpt 49-. I. Anatomy & physiology of Muscular system n A. 3 types of muscle tissue –1. skeletal muscle aka striated muscle–

Ch : Contraction and Metabolism of Skeletal Muscle

Interaction of thick & thin filaments __________________ –_____________________________________ _____________________________________ –_____________________________________.

Figure Ball-and-socket joint Head of humerus Scapula Hinge joint Humerus Ulna Radius Pivot joint.

Sliding Filament.

Filaments Resting state Electrical impulse (Action Potential) reaches axon terminal.

Synapse – The site of connection between a neuron and a cell. Neurotransmitter – A chemical released at the neuron’s synapse that communicates with the.

Muscle Physiology Dynamics of Muscle Contraction MMHS Anatomy.

The Sliding Filament Theory

Skeletal Muscle Contraction

The Physiology of Skeletal Muscle Contraction

Neuromuscular Junction and Major Events of Muscle Contraction Quiz Review.

Chapter 9 Muscular System.

Muscle Contraction. 1.Acetylcholine (Ach) is released from the axon terminal (nerve) into the synaptic cleft and binds to Ach receptors in the sarcolemma.

Muscle voluntary, striated involuntary, striated auto-rhythmic involuntary, non-striated evolved first multi-nucleated digestive system arteries, veins.

Muscle Contraction.

Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings WHOLE MUSCLE CONTRACTION:PART 1 Motor units All the muscle fibers innervated.

The Muscular System What do skeletal muscles do? How do muscles work?

Muscles & Motion. Evolution of Movement 1) epitheliomuscular cells 1) epitheliomuscular cells in Cnidarians in Cnidarians epithelial cells w/ contractile.

Skeletal Muscle Blank.

The Muscular System What do skeletal muscles do? How do muscles work?

2. Striation Pattern of Sarcomere

Initially Sarcolemma is in the Resting Membrane state

9 Muscles and Muscle Tissue: Part B-Muscle Contraction and Signal Transmission.

The Structure of Skeletal Muscle

MUSCLE CONTRACTION © 2016 Paul Billiet ODWS.

The Muscular System What do skeletal muscles do? How do muscles work?

Musculoskeletal System - Muscles

Physiology of Muscle Contraction

LECTURE 14 CHAPTER 12 MECHANISMS OF CONTRACTION AND NEURAL CONTROL

NOTES: The Muscular System (Ch 8, part 2)

Muscles & Motion.

Excitation-Contraction Coupling 1. Impulse arrives from motor neuron 2. Neuron releases acetylcholine (Ach) into synapse with muscle 3.

Physiology Review (ppt modified from recreation. ucsb

Sliding Filament Theory

Contraction of Skeletal Muscle

Presentation transcript:

Muscles & Motion

Evolution of Movement 1) epitheliomuscular cells in Cnidarians epithelial cells w/ contractile protein arrays (actin & myosin) 2) epitheliomuscular cells sank below surface into connective tissues and became muscle

Bundles of muscle cells fuse together inside a covering of connective tissue Bundles of fused muscle cells form muiltinucleate muscel fibers The connective tissue covering extend past the muscle fibers to attach to bones

Regulatory Proteins Tropomyosin – blocks myosin binding sites on actin Troponin complex – move tropomyosin out of the way so myosin can bind to the actin ….activated by Ca

Myosin heads primed by ATP

Binding site blocked by tropomyocin Ca bonding to troponin Δ its shape Δ troponin moves tropomyocin out of binding site Myosin binds to actin

Myosin releases ADP and P and bends toward center of sarcomere Actin pulled toward center ATP binds myosin & resets myosin head http://www.dnatube.com/video/1306/Role-of-myosin-crossbridge-in-the-contraction-of-muscle

Neuromuscular Junctions CNS sends action potential down motor N Synaptic Vs release Ach (acetylcholine) Ach diffuses across synapse Ach binds to membrane receptors triggers action potential that spreads through muscle fiber along T-tubules T-tubules are infoldings of cell membrane http://www.dnatube.com/video/1950/Molecular-events-in-muscle-contraction http://msjensen.cehd.umn.edu/1135/Links/Animations/Flash/0010-swf_action_potenti.swf

Sarcoplasmic Reticulum (SR) Action Potentia in T-tubule activates SR http://www.sumanasinc.com/webcontent/animations/content/muscle.html 1. SR releases Ca into muscle fiber 2. Ca binds to Troponin 3. Troponin moves Tropomyosin 4. Muscle contracts http://www.youtube.com/watch?v=XoP1diaXVCI

Lack of Action Potential Sarcoplasmic Reticulum pumps Ca back in Low Ca levels in muscle fiber Tropomyosin blocks myosin binding sites on actin. Sarcomeres relax