Fig. 10-3. Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.

Slides:



Advertisements
Similar presentations
Neuromuscular Junction
Advertisements

Muscle Physiology Chapter 1.
Sliding Filament Theory How do muscles work…... Muscle Cell Structure n Muscles are broken into smaller muscle fibers n muscle fibers are broken into.
The Organization of a Skeletal Muscle Figure 7-1.
Muscle Function.
MUSCULAR SYSTEM. Types of muscles SkeletalCardiacSmooth.
Notes: Sliding Filament Theory [Muscle Contraction Physiology]
CONTRACTION OF SKELETLAL MUSCLE: SLIDING FILAMENT THEORY
The Steps of Muscle Contraction: The Sliding Filament Theory
Muscles n Skeletal muscle organization and how it contracts.
Muscular system SKELETAL MUSCLE Skeletal muscle is made up of hundreds of muscle fibers –Fibers consists of threadlike myofibrils –Myofibrils composed.
Sliding Filament Theory Review
Sliding Filament Mechanism
Sliding Filament Theory
The Steps of the Sliding Filament Theory
Warm-Up 4/8/15 1.What is an autoimmune disorder? 2.What how are LEMS and MG similar? 3.How are LEMS and MG different? Test - Tuesday.
09_10 Sliding filament theory Slide number: 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Tropomyosin.
Motor mechanisms. Keywords (reading p ) Bundle, fiber, myofibril, sarcomere Z-line, thick filament, thin filament Actin, myosin, sliding filament.
Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Neuromuscular Junction Figure 9.7 (a-c)
Muscle fiberMotor neuron Nucleus. SarcolemmaMyofibrils Sarcoplasmic reticulum (SR) T-tubule SR Cistern.
Sliding Filament Theory
Myosin Myosin is a protein molecule found in the thick filaments. Myosin is a protein molecule found in the thick filaments.
Muscle Physiology.
The Muscular System What do skeletal muscles do? How do muscles work?
 Name the following movements: ◦ Increasing angle of joint (ex. Straightening arm) ◦ Moving around longitudinal axis: ◦ Moving a limb away from midline.
MUSCLE CONTRACTION. Microscopic Anatomy of Skeletal Muscle Sarcomere Contractile unit of a muscle fiber Figure 6.3b.
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.
11.2.Muscles and movement. State the roles of bones, ligaments, muscles, tendons and nerves in human movement. Label a diagram of the human elbow joint,
Hair cells, actin bundles, and unconventional myosins.
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.
Chapter 38: Protection, Support, Movement: Skin, Skeleton, and 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.
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.
II. Skeletal Muscle Overview A. Skeletal Muscle Distinguishing Characteristics Striated Voluntary Multi-nucleated B. Functions Movement Maintain Posture.
The Sliding Filament Theory
Muscular System Notes. Microscopic Muscle Anatomy  Myfibrils  About 1-2 micrometers in diameter  Length of a muscle fiber  Composed of multiple myofilaments.
Muscle Physiology – How does this thing work?
The Physiology of Skeletal Muscle Contraction
Figure 10.6 Levels of Functional Organization in Skeletal Muscle Fiber
Skeletal Muscle Microscopic Anatomy Chapter 10. Microscopic Anatomy Muscle fibers = muscle cells: long and multinucleate Sarcolemma: cell membrane myoglobinSarcoplasm:
Neuromuscular Junction and Major Events of Muscle Contraction Quiz Review.
Muscular System The 3 Types of Muscles SKELETAL MUSCLE STRUCTURE.
Muscle Contraction. 1.Acetylcholine (Ach) is released from the axon terminal (nerve) into the synaptic cleft and binds to Ach receptors in the sarcolemma.
Sarcomere Physiology: Sliding Filament Theory This is pretty exciting!
Muscle Contraction.
The Muscular System What do skeletal muscles do? How do muscles work?                      
Skeletal Muscle Lab. Three Muscle Types Parts of the Muscle Fiber.
The Muscular System What do skeletal muscles do? How do muscles work?
Muscle Fiber Contraction
Muscle contraction.
Initially Sarcolemma is in the Resting Membrane state
Molecular mechanism of muscle contraction
Muscular System Notes Unit 6.
The Muscular System What do skeletal muscles do? How do muscles work?
A skeletal muscle is composed of a variety of tissues
Musculoskeletal System - Muscles
Muscle Contraction.
NOTES: The Muscular System (Ch 8, part 2)
THE MUSCLE CELL.
NOTES: The Muscular System (Ch 8, part 3)
Contraction II Department of Biology, WCU.
Muscles.
Sliding Filament Theory
Types of Myofilaments.
Presentation transcript:

Fig Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.

Fig Review of thin and thick filament structure

Fig Overview of the process

The muscle fiber is stimulated.

Fig Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released.

Fig “End- on” view of thick & thin filaments, showing the effect of calcium ions after release from the S.R.

Fig Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released.

Fig Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere.

Fig Calcium attaches to troponin/ tropomyosin; they roll away, exposing the active site on actin.

Fig Myosin cross-bridges attach to active site on actin. After attachment, the cross-bridges pivot, pulling the thin filaments.

Fig A fresh ATP replaces the ADP+P i, allowing myosin and actin to detach. Energy from the splitting of the fresh ATP allows repositioning of the myosin head.

Fig This leads back to Step 1, which continues the cycle as long as calcium ions are attached to troponin/tropomyosin.

Fig Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere.

Fig Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere. Muscle fiber contracts.

Fig Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere. Muscle fiber contracts. Muscle tension increases.