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| | Muscle - Wikipedia, the free encyclopedia |
 | | Skeletal muscle or "voluntary muscle" is anchored by tendons to bone and is used to affect skeletal movement such as locomotion. | | | Deep muscles, superficial muscles, muscles of the face and internal muscles all correspond with dedicated regions in the brain. | | | Voluntary muscle contraction is used to move the body and can be finely controlled, such as movements of the finger or gross movements like the quadriceps muscle of the thigh. |
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http://en.wikipedia.org/wiki/Muscle
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| | Muscle contraction - Wikipedia, the free encyclopedia |
| | Typically when a human is exerting a muscle as hard as they are conciously able, roughly one-third of the fibers in that muscle will be firing at once, but various physiological and psychological factors can affect that. | | | However, some muscles (such as the heart) do not contract as a result of conscious effort. | | | Locomotion in most higher animals is possible only through the repeated contraction of many muscles at the correct times. |
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http://en.wikipedia.org/wiki/Muscle_contraction
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| | Muscle Physiology - Types of Contractions |
| | As the load on the muscle increases, it finally reaches a point where the external force on the muscle is greater than the force that the muscle can generate. | | | Eccentric contractions are currently a very popular area of study for three main reasons: First, much of a muscle's normal activity occurs while it is actively lengthening, so that eccentric contractions are physiologically common (Goslow et al. | | | When we think of a muscle contracting normally, we tend to think of the muscle shortening as it generates force. |
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http://muscle.ucsd.edu/musintro/contractions.shtml
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| | e-Muscles.net: Muscles, skeletal, smooth, cardiac |
| | Smooth muscle is found in the walls of blood vessels, tubular organs such as the stomach and uterus, the iris, or associated with the hair follicles. | | | The force behind muscle contraction is the ratchet movement of these tiny myosin heads toward the center of their sarcomere. | | | White muscles contain mostly Type IIB fibers and are specialized for fast, fine movements as in the muscles that move the eye or some hand muscles. |
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http://www.e-muscles.net
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| | Muscle contraction |
| | Isometric contractions are characteristic by the fact that there is very little change in the length of the muscle and therefore very little movement is produced as a result of the contraction. | | | The muscle will be stronger during the negative phase of the contraction which means that when positive muscular failure has occurred the athlete can continue to work in the negative phase. | | | In order to work the muscle maximally throughout the range of the movement weight would have to be added and removed at specific stages. |
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http://www.shelfieldpeonline.co.uk/html/muscle_contraction.html
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| | MUSCLE CONTRACTION |
| | Correspondingly, the degree of tension in the muscle increases. | | | Huxley, A. Muscle structure and theories of contraction. | | | The research of Gordon, et al, further demonstrated that tension in muscles depends on the degree of overlap between myosin and actin filaments. |
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http://www.tiem.utk.edu/~gross/bioed/webmodules/muscles.html
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| | Muscle Biochemistry |
| | Consequently, fast-acting skeletal muscles are composed of dominantly glycolytic white fibers while slow-acting muscles such as those that maintain tone are generally red and oxidative. | | | During contraction and relaxation the distance between the Z lines varies, decreasing with contraction and increasing with relaxation. | | | It is important to note that in relaxed muscle, myosin is in its high-energy conformational state. |
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http://web.indstate.edu/thcme/mwking/muscle.html
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| | MedlinePlus Medical Encyclopedia: Muscle cramps |
| | Muscle cramps are involuntary and often painful contractions of the muscles which produce a hard, bulging muscle. | | | Ordinary muscle cramps are common and may be stopped by stretching the affected muscle. | | | Typically, these contractions only affect individual muscle groups connected to (innervated by) a particular motor neuron. |
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http://www.nlm.nih.gov/medlineplus/ency/article/003193.htm
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| | Introduction: Muscle contraction headache - WrongDiagnosis.com |
| | Treatments for Muscle contraction headache: Various information is available about treatments available for Muscle contraction headache, or research treatments for other diseases. | | | Causes of Muscle contraction headache: Research more detailed information about the causes of Muscle contraction headache, other possibly hidden causes of Muscle contraction headache, or other general information about Muscle contraction headache. | | | Muscle contraction headache information: Headache from tension or muscle contraction. |
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http://www.wrongdiagnosis.com/m/muscle_contraction_headache/intro.htm
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| | SMOOTH MUSCLE |
| | Treatment of the muscle with chlorpromazine (the calmodulin inhibitor) also abolished both the stretch-induced LC phosphorylation and the stretch-release-induced tension development. | | | P-labeling of the muscle is a reliable method for such studies. | | | (Under the same conditions, the actin-activated skeletal muscle myosin ATPase is 10 -20 mol/mol/sec). |
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http://www.uic.edu/classes/phyb/phyb516/smoothmuscleu3.htm
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| | Lecture Notes-13 |
| | ATP is Required for Both Contraction and Relaxation of Muscle | | | Skeletal muscle attaches to bones which form levers- used for bodily movement | | | Skeletal and cardiac muscle are striated (smooth muscle has a similar contractile mechanism but is not so highly organized and does not show striations) |
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http://members.aol.com/Bio50/LecNotes/lecnot13.html
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| | Muscle Contraction - Mechanics |
| | The contractile response of a skeletal muscle fiber in situ to a neural stimulus is an all-or-none property. | | | During a muscle twitch, which process is responsible for a longer muscle relaxation than muscle contraction? | | | is found in the leg muscles of sprinters |
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http://facstaff.elon.edu/shouse/physiology/physiol15/Lecture8.html
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| | Human Physiology - Muscle |
| | A muscle, like the biceps, contracts with varying degrees of force depending on the circumstance (this is also referred to as a graded response). | | | With rapid stimulation (so rapid that a muscle does not completely relax between successive stimulations), a muscle fiber is re-stimulated while there is still some contractile activity. | | | muscle of the viscera (e.g., in walls of blood vessels, intestine, and other 'hollow' structures and organs in the body) |
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http://people.eku.edu/ritchisong/301notes3.htm
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| | MUSCLE CONTRACTION HEADACHE |
| | When muscles are in spasm, they become painful and sometimes irritate nerves that can produce pain at the base of the skull and the scalp. | | | One of the most common types of headache is the tension-type, or muscle contraction headache. | | | These headaches can be caused or aggravated by muscle spasms of the shoulder and neck. |
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http://www.usdoctor.com/occipt0.htm
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| | Muscle Contraction |
| | Below are two different but similar descriptions of muscle contraction that explain the processes involved in notification, contraction, and relaxation. | | | (1) The sequence of events leading to contraction is initiated somewhere in the central nervous system, either as voluntary activity from the brain or as reflex activity from the spinal cord. | | | (12) In the living animal, an external stretching force, such as gravity or an antagonistic muscle, pulls the muscle back to its original length. |
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http://savell-j.tamu.edu/muscontract.html
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| | Muscle Home Page |
| | Smooth muscle contraction speeds are very slow when compared with voluntary muscle, but it can achieve a much greater degree of shortening, and it is very economical to operate. | | | Introduction: All the muscles in the human body show biochemical specialisation which allows them to perform their particular physiological functions. | | | They are blocked by the important drugs verapamil and nifedipine, which reduce the force of cardiac contraction, while maintaining an adequate cardiac output by relaxing vascular smooth muscle and reducing the peripheral vascular resistance. |
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http://www.bmb.leeds.ac.uk/illingworth/muscle
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| | MUSCLE CONTRACTION HEADACHE |
| | Cervicogenic headaches and muscle contraction headaches are the most common and most misunderstood origin of "headache" pain. | | | Therefore, muscle contraction or cervicogenic headaches are felt as a tightening band across the forehead and into the eyes. | | | 80% of all headaches are muscle contraction/ cervicogenic/ and analgesic rebound!! |
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http://www.usdoctor.com/head4.htm
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| | Smooth muscle contraction |
| | While smooth muscle is unique in several aspects, the basic principles of muscle contraction are similar in smooth and skeletal muscle. | | | Smooth muscles of the iris regulate diameter of the pupil and affect our vision. | | | In the last article we have considered a variety of functions the smooth muscles serve in our bodies. |
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http://www.suite101.com/article.cfm/our_beautiful_bodies/93531
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| | Muscles |
| | Smooth muscle is found in the walls of all the hollow organs of the body (except the heart). | | | The contraction of smooth muscle tends to be slower than that of striated muscle. | | | The refractory period in heart muscle is longer than the period it takes for the muscle to contract (systole) and relax (diastole). |
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http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Muscles.html
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| | THE EXCITATION |
| | This is logical because the postural muscles must keep performing the same job over extended periods of time; essentially holding the body in the upright position. | | | This means that nerves are fairly firmly attached to the muscles they innervate; otherwise, nerves might be torn away by the action of the muscles themselves! | | | Sarcomeres are repeating contractile units within a muscle fiber. |
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http://faculty.etsu.edu/currie/excitation.htm
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| | MUSCLE CONTRACTION |
| | tone, as in the muscles of the head, neck and shoulders, | | | with and the way the muscle is attached to the joint. | | | In addition, muscles are involved in such essential |
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http://www.tpub.com/content/medical/14295/css/14295_28.htm
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| | Lecture Notes-14 |
| | The muscle is stretched to a point where there is very little overlap between actin and myosin. | | | The muscle does not completely relax between stimuli and the tension summates to 35% of maximum | | | In the figure below a muscle is stimulated at 0.5 seconds and again at 2.5 seconds; there is complete relaxation between the stimuli and the tension reaches only 25% of maximum |
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http://members.aol.com/Bio50/LecNotes/lecnot14.html
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| | muscle: Muscle Contraction |
| | Injury to skeletal muscle fibers during contractions: conditions of occurrence and prevention. | | | This permits muscles to contract quickly when stimulated without having to overcome the inertia of total relaxation. | | | The energy required for muscle contraction comes from the breakdown of |
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http://www.infoplease.com/ce6/sci/A0859831.html
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| | Introduction to the mechanism of muscle contraction |
| | The study of muscle contraction involves the use of a large variety of biophysical techniques, in many laboratories around the world. | | | The link between movement or force and the utilization of ATP is the fundamental aspect of muscle contraction, sometimes referred to as the energy transduction process. | | | Does each head behaves independently of the other ? |
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http://www.ebsa.org/npbsn41/intro_muscle.html
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| | eMedicine - Muscle Contraction Tension Headache : Article by Manish K Singh, MD |
| | Headache is not related directly to muscle contraction, and possible hypersensitivity of neurons in the trigeminal nucleus caudalis has been suggested. | | | It had various ill-defined names in the past including tension headache, stress headache, muscle contraction headache, psychomyogenic headache, ordinary headache, and psychogenic headache. | | | Heat, massage, and stretching can be used to alleviate excess muscle contraction and pain. |
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http://www.emedicine.com/neuro/topic231.htm
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| | Bio. 118 - MUSCLE CONTRACTION & ENERGETICS |
| | muscles attach "across" a joint, to 2 bones | | | largest numbers present in developing fetus or child as muscles form | | | Virginia-Maryland Regional College of Veterinary Medicine - skeletal muscle histology images |
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http://faculty.washington.edu/kepeter/118/notes/ms-contract.htm
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| | Howstuffworks "How Muscles Work" |
| | For example, your biceps muscle is attached to your shoulder blade at one end and to your ulna in your forearm at the other end. | | | The shortening of the fibers creates mechanical force, or muscle tension. | | | Whether the muscle itself changes length (same-force or isotonic contraction) or not (same-length or isometric contraction) depends upon the load attached to the muscle. |
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http://www.howstuffworks.com/muscle4.htm
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| | The Biochemistry of Muscle Contraction |
| | Also notice how the distance between these features changes as the muscle tissue contracts and relaxes. | | | Contraction is accomplished by a shortening of the muscle fibers. | | | To learn more about how the structure of these proteins is involved in their function, in the contraction of muscle tissue, in the beating of the human heart, and in human life, contact: |
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http://www.bgsu.edu/departments/chem/midden/chem308/Muscle_Biochem.html
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| | Muscle Contraction |
| | In hypoKPP the calcium channels malfunction causing the muscle fibers to become unresponsive. | | | Muscle contraction is inhibited if the channels do not work properly. | | | Contraction is stimulated by a chemical called acetylcholine released from an attached nerve. |
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http://www.e-wire.net.au/~eb_grtyl/PPSA_muscle.htm
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| | Muscle Contraction |
| | Teaching Materials; Muscle, Skeletal / ultrastructure; Muscle Contraction; Joints; Bone and Bones; | | | Home page for the Journal of Muscle Research and Cell Motility, which covers articles on "the excitation and contraction of muscle, the analysis of the processes involved, and the processes underlying cell contractility and motility." Information is provided on the aims and scope, instructions for authors and subscription details. | | | The Muscular and Skeletal Systems chapter contains sections on types of skeletal systems, functions of muscles and bones, the axial and appendicular skeletons, bone tissue, bone growth, joints, skeletal muscle systems, contraction of nonmuscular cells, and interaction of the two systems. |
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http://bioresearch.ac.uk/browse/mesh/D009119.html
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| | muscle contraction - definition of muscle contraction by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | muscle contraction - (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber) | | | vaginismus - muscular contraction that causes the vagina to close; usually an anxiety reaction before coitus or pelvic examination | | | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. |
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http://www.thefreedictionary.com/muscle+contraction
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| | Muscle Contraction |
| | This substance causes change in membrane permeability of sarcolemma (muscle fiber membrane). | | | 3) The change in sarcolemma permeability results in depolarization, which features Na+ influx and K+ efflux from the muscle fiber, and is propagated to the sarcoplasmic reticulum, which then releases stored Ca++ into the sarcoplasm. | | | The energy thereby released leads to bending of the myosin head, which tugs on the attached action filament. |
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http://bms.brown.edu/curriculum/b189/Lectures/muscle-contract.htm
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| | Cardiac Muscle: Contraction |
| | Contractile apparatus is the same as skeletal muscle fibers | | | Purkinje fibers = cardiac muscle fibers specialized for impulse conduction, part of the pace maker - they regulate pattern of contraction, which needs to be non-simultaneous and co-ordinated in three dimensions (compare skeletal muscle) | | | T-tubules at the level of the Z-line rather than the A & I bands |
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http://www.vcu.edu/anatomy/OB/Muscle~1/tsld016.htm
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| | Muscle Contraction: Sliding Filaments |
| | (B) During contraction, the actin and myosin filaments slide past each other without shortening. | | | The sliding motion is driven by the myosin heads walking toward the plus end of the adjacent actin filament. | | | Recall that actin filaments are anchored by their plus ends to the Z disc and that myosin filaments are bipolar. |
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http://www.accessexcellence.org/AB/GG/muscle_Contract.html
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