Quantcast
Follow us On YouTube Follow us On FaceBook



or
Search Language
Browse
Medical Animations
Medical Animation Titles
Custom Legal Animations
Patient Health Articles
Custom Interactive
Most Recent Uploads
Body Systems/Regions
Anatomy & Physiology
Diseases & Conditions
Diagnostics & Surgery
Cells & Tissues
Cardiovascular System
Digestive System
Integumentary System
Nervous System
Reproductive System
Respiratory System
Back and Spine
Foot and Ankle
Head and Neck
Hip
Knee
Shoulder
Thorax
Medical Specialties
Cancer
Cardiology
Dentistry
Editorial
Neurology/Neurosurgery
Ob/Gyn
Orthopedics
Pediatrics
Account
Administrator Login
Muscle Contraction - Medical Animation
 
This animation may only be used in support of a single legal proceeding and for no other purpose. Read our License Agreement for details. To license this animation for other purposes, click here.

If animation does not play, download and install the latest free Flash Player plugin.
More Like ThisAdd To Lightbox ANM11013 Enlarge
Ready to Purchase?

$999.00

Order by phone: (800) 338-5954
Item #ANM11013Source #1

Muscle Contraction - Medical Animation
MEDICAL ANIMATION TRANSCRIPT:
Skeletal muscles are voluntary, controlled consciously by the nervous system, and are made up of fascicles, which are bundles of muscle fibers surrounded by connective tissue, blood vessels, and nerves. Motor nerve axons supply one or more skeletal muscle fibers, constituting a motor unit. Inside a muscle fiber, thread-like structures called myofibrils are organized into contractile units, or sarcomeres, reflecting the striations characteristic of skeletal muscle. Each sarcomere is made up of thick and thin myofilaments, strands of proteins called myosin and actin. Myosin forms thick filaments. Actin forms thin filaments. The protruding heads of myosin filaments form cross bridges that bind to actin filaments and ATP, an energy transport molecule. Thin filaments contain a sequence of actin molecules with myosin-binding sites. At rest, actin molecules bind tropomyosin and troponin, two contractile proteins that inhibit contraction. Skeletal muscle contraction begins at the muscle fibers' plasma membrane, or sarcolemma, with invaginations called transverse or T-tubules that surround each myofibril, and open to the extracellular space. T-tubules connect to a membranous network called the sarcoplasmic reticulum that store calcium and transfer ions via voltage-gated channels into the myofibril sarcoplasm to regulate muscle contraction. In the first step of muscle contraction, called excitation, a motor nerve fires an impulse, or action potential, across the neuromuscular junction, depolarizing the sarcolemma, and generating an action potential that spreads through the sarcolemma into the T-tubules, and excites the muscle fiber. The second step is coupling, wherein the action potential depolarizes the T-tubules. Channels in the sarcoplasmic reticulum release calcium into the sarcoplasm. Along the myofilaments, troponin binds calcium and separates from tropomyosin. In the third step, called contraction, tropomyosin shifts away from actin to expose the myosin-binding sites, enabling myosin to bind to actin, resulting in the activation of ATP and the cross bridges. Released energy causes the myosin heads to rotate and pull the thin filaments inward, sliding past the thick filaments and shortening the sarcomere. The fourth step of muscle contraction is relaxation, in which calcium ions return to the sarcoplasmic reticulum and break the myosin-actin bonds. The cross bridges disengage, and the sarcomere lengthens, resulting in relaxation of the muscle and the end of the contraction. ♪ [music] ♪

YOU MAY ALSO WANT TO REVIEW THESE ITEMS:
Airway Abnormalities
Airway Abnormalities - exh4645c
Medical Exhibit
Add to my lightbox
Find More Like This
Respiratory Pathologies
Respiratory Pathologies - exh59171b
Medical Exhibit
Add to my lightbox
Find More Like This
Coronary Artery Stenosis with Placement of Multiple Stents
Coronary Artery Stenosis with Placement of Multiple Stents - exh61553a
Medical Exhibit
Add to my lightbox
Find More Like This
Left Sided Heart Failure
Left Sided Heart Failure - ANM10003
Medical Animation
Add to my lightbox
Find More Like This
Heart Failure
Heart Failure - ANM10004
Medical Animation
Add to my lightbox
Find More Like This
Right Sided Heart Failure
Right Sided Heart Failure - ANM10006
Medical Animation
Add to my lightbox
Find More Like This
What attorneys say about MLA and The Doe Report:
"It is with great enthusiasm that I recommend Medical Legal Art. We have used their services for three years and always found their professionalism, quality of work, and timely attention to detail to exceed our expectations. We recently settled two complicated catastrophic injury cases. One medical malpractice case involving a spinal abscess settled for 3.75 million and the other involving injuries related to a motor vehicle accident settled for 6.9 million. We consider the artwork provided by MLA to have been invaluable in helping us to successfully conclude these cases.

I highly recommend MLA to anyone seeking high quality, detailed medical legal artwork."

E. Marcus Davis, Esq.
Davis Zipperman, Krischenbaum & Lotito
Atlanta, GA
www.emarcusdavis.com

"I would like to thank all of you at Medical Legal Art for all the assistance you provided. It was a result of the excellent, timely work that we were able to conclude the case successfully.

I feel very confident that our paths will cross again."

Fritz G. Faerber
Faerber & Anderson, P.C.
St. Louis, MO

"Whether it's demonstrating a rotator cuff tear, neck movement a few milliseconds after rear impact, or a proposed lumbar fusion, the Doe Report represents an instant on-line database of medical illustration for health-care and legal professionals.

Illustrations can be purchased 'as is' or modified within hours and sent either electronically or mounted on posterboard. An illustration is worth a thousand words, as juries perk up and look intently to capture concepts that are otherwise too abstract. Start with good illustrations, a clear and direct voice, a view of the jury as 12 medical students on day one of training, and your expert testimony becomes a pleasure, even on cross examination. An experienced trial lawyer should also emphasize these illustrations at the end of trial, as a means of visually reinforcing key concepts covered.

As a treating physician, I also use these accurate illustrations to educate my own patients about their medical conditions. The Doe Report is an invaluable resource, and its authors at MLA have always been a pleasure to work with."

Richard E. Seroussi M.D., M.Sc.
Diplomate, American Boards of Electrodiagnostic Medicine and PM&R
Seattle Spine & Rehabilitation Medicine
www.seattlespine.info

"Our practice involves medical negligence cases exclusively. We have six attorneys and one physician on staff. We have used Medical Legal Art's staff for every one of our cases over the past 12 years and have found their services to be extraordinary. The transformation of medical records into powerful graphic images has without fail been handled expertly, expeditiously and effectively translating into superb results for our clients, both in the courtroom and in settlement. Every case can benefit from their excellent work and we unqualifiedly recommend their services. They are the best!"

Chris Otorowski
Morrow and Otorowski
Bainbridge Island, Washington
www.medilaw.com













Awards | Resources | Articles | Become an Affiliate | Free Medical Images | Pregnancy Videos
Credits | Jobs | Help | Medical Legal Blog | Find a Lawyer | Hospital Marketing