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Types of Muscle, structure and Function
Types of muscle 3 General types 1) Smooth (visceral) muscleLoosely associated fibers Peristalsis Found in dig. tract, lungs, arteries
Cardiac Muscle Tightly associated fibersGap junction and intercalated discs allow for quick exchange between cells Found only in the heart
Skeletal Muscle Tightly associated fibersResponsible for moving the skeleton Found everywhere in the body attached to skeleton
Structure of Skeletal MusclesLong thin fibers of sarcomeres connected end-to-end Fibers bundled into fascicles
Sarcomere Basic unit of contraction Sarcolemma surrounds itActin – thin filament Mysosin- thick filament Tropomyosin covers myosin clubs to prevent bonding during relaxation
How contraction occursBrain triggers muscle to contract Message travels down nerve Crosses synapse and hits sarcolemma
Next…. Sarcolemma releases Calcium ions into sarcomereCa binds with troponin Triggers tropomyosin to move
Contraction begins With tropomyosin out of the way, myosin clubs attach to actin filament Forms cross bridges
Finally… ATP binds to cross bridge Causes club position to movePulls actin fiber with it Shortened sarcomere = contraction
After contraction ATP is required to break bonds and relax muscleRigor mortis
The Muscular System.
Muscle Structure and Function
Outline I. Types of Muscle II. Anatomy of Skeletal Muscle III. Sliding Filament Theory IV. Role of Ca+ in regulating muscle contraction.
Skeletal Muscle Contraction Notes. Review Epimysium (outer covering of muscle) Fascicle (bundle of muscle fibers) Perimysium (covering fascicle) Endomysium.
Neuromuscular Junction and Major Events of Muscle Contraction Quiz Review.
Synapse – The site of connection between a neuron and a cell. Neurotransmitter – A chemical released at the neuron’s synapse that communicates with the.
IN CLASS NOTES = STEPS OF A MUSCLE CONTRACTION. STEP 1 Calcium ions present Ca+ binds to troponin which makes tropomyosin move out of way for myosin head.
How do muscle cells contract ?. What is the structure of a muscle fiber ? The sarcolemma, or plasma membrane contains invaginations called T (transverse)
Cardiac Muscle Involuntary –heart only Contracts & relaxes continuously throughout life –Contracts without nervous stimulation! –A piece of cardiac muscle.
Sliding Filament Theory
Skeletal Muscle Key words:. Overview of the Muscle Fiber Structure Muscle fibers (cells) are composed of myofibrils Myofibrils are composed of myofilaments.
Sarcomere Physiology: Sliding Filament Theory This is pretty exciting!
Sliding Filament Mechanism
Filaments Resting state Electrical impulse (Action Potential) reaches axon terminal.
MUSCLE CONTRACTION. Microscopic Anatomy of Skeletal Muscle Sarcomere Contractile unit of a muscle fiber Figure 6.3b.
7.2 Microscopic Anatomy and Contraction of Skeletal Muscle
Muscle Cells & Muscle Fiber Contractions
CONTRACTION OF SKELETLAL MUSCLE: SLIDING FILAMENT THEORY
Muscle tissue and muscle contraction Rosalie Crawford - Veronica Revel Fondazione Liceo Linguistico Courmayeur CLIL SCIENCE.
The Physiology of Skeletal Muscle Contraction Muscle Cell Anatomy Sarcolemma Muscle cell membrane Sarcoplasmic reticulum Reservoir of Ca ++ Ions.
Name the following movements: ◦ Increasing angle of joint (ex. Straightening arm) ◦ Moving around longitudinal axis: ◦ Moving a limb away from midline.
Muscular system SKELETAL MUSCLE Skeletal muscle is made up of hundreds of muscle fibers –Fibers consists of threadlike myofibrils –Myofibrils composed.
Chapter 6: 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.
The Muscular System What do skeletal muscles do? How do muscles work?
Muscle Physiology Chapter 7.
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–
Muscle Tissue Cont. Physiology Chapter 10. Contraction of Skeletal Muscle = The Sliding Filament Mechanism thin and thick filaments slide past each.
Fig Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.
Muscle MCQs. The fibrous connective tissue sheath which encloses a whole muscle is called the endomysium. perimysium. epimysium. sarcolemma.
Sliding Filament Theory Review
Sliding Filament Thick & thin filaments Myosin tails aligned together & heads pointed away from center of sarcomere.
Muscle Physiology Dynamics of Muscle Contraction MMHS Anatomy.
Motor mechanisms. Keywords (reading p ) Bundle, fiber, myofibril, sarcomere Z-line, thick filament, thin filament Actin, myosin, sliding filament.
Flash Cards Chapter A muscle which assists another in an action is called a(n):
1 Chapter 9 Muscular System. 2 Introduction: A.All movements require muscle. B.The three types of muscle in the body are skeletal, smooth, and cardiac.
The Muscular System Skeletal muscle consists of numerous muscle cells called Muscle fibers. Muscle fiber terminology and characteristics Sarcolemma = plasma.
Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.
Movements – - voluntary – intend to make; ex. walking - involuntary – you do not control; ex. breathing.
Smooth - no striations, involuntary visceral organs Skeletal - striated, voluntary, tires easily, powerful Cardiac - striated, involuntary intercalated.
Physiology of the Muscular System Chapter 11
Muscular System. Facts about muscles… A skeleton cannot move by itself > 40% of the mass of the average human body is muscle Found everywhere in your.
Interaction of thick & thin filaments __________________ –_____________________________________ _____________________________________ –_____________________________________.
Sliding Filament Theory How do muscles work…... Muscle Cell Structure n Muscles are broken into smaller muscle fibers n muscle fibers are broken into.
Chapter 9 Muscles and Muscle Tissue
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