Muscle
hideMuscle (from Latin musculus, diminutive of mus "mouse") is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh. There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.
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News tagged with muscle strength
Reduced muscle strength associated with risk for Alzheimer's
Medicine & Health / Neuroscience
Nov 09, 2009 |
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Individuals with weaker muscles appear to have a higher risk for Alzheimer's disease and declines in cognitive function over time, according to a report in the November issue of Archives of Neurology.
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Muscle cell infusion shown to strengthen sphincters in animals
Dec 04, 2009 |
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A new study shows that muscle cells grown in the lab can restore an intestine's ability to squeeze shut properly. The work, performed in dogs and rats, might ultimately help treat patients with conditions such as gastric ...
Glaxo's swine flu shot may give kids fever
Medicine & Health / Medications
Dec 04, 2009 |
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(AP) -- The European Medicines Agency warns that young children given GlaxoSmithKline's swine flu shot may get a fever after their second dose.
Mice holding back muscular dystrophy research
Dec 04, 2009 |
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Humans and mice have previously unknown and potentially critical differences in one of the genes responsible for Duchenne muscular dystrophy (DMD). Researchers writing in the open access journal BMC Biology have found that t ...
Poisonous Poisson
Dec 04, 2009 |
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In contrast to the exhaustive research into venom produced by snakes and spiders, venomous fish have been neglected and remain something of a mystery. Now, a study of 158 catfish species, published in the ...
Study confirms that cannabis is beneficial for multiple sclerosis
Medicine & Health / Neuroscience
Dec 04, 2009 |
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Cannabis can reduce spasticity in multiple sclerosis (MS) patients. A systematic review, published in the open access journal BMC Neurology, found that five out six randomized controlled trials reported a reduction in spa ...
Comcast-NBC deal shows future is in content
Dec 04, 2009 |
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(AP) -- Comcast Corp. is buying control of NBC Universal from GE largely because Comcast wants to own more movies and TV shows. The point is to give it a position of strength if fewer people sign up for its ...
Professor foresees rising Antarctic snowmelt
Space & Earth / Earth Sciences
Dec 03, 2009 |
2 / 5 (1) |
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The 30-year record low in Antarctic snowmelt that occurred during the 2008-09 austral summer was likely due to concurrent strong positive phases for two main climate drivers, ENSO (El Niño - Southern Oscillation) and SAM ...
Study explains how exercise helps patients with peripheral artery disease
Dec 03, 2009 |
5 / 5 (2) |
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Peripheral artery disease (PAD) affects 5 million individuals in the U.S. and is the leading cause of limb amputations. Doctors have long considered exercise to be the single best therapy for PAD, and now a new study helps ...
Doctors Warn Against Holiday Heart Attack Spike
Dec 03, 2009 |
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(PhysOrg.com) -- Some studies indicate that death rates from heart attacks and stroke as well as non-heart-related causes spike during the holiday season.
Jackson film not part of Sony's new 3-D vision
Dec 03, 2009 |
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(AP) -- Michael Jackson videos or the next Spider-Man movie won't be among the titles that Sony Corp. releases in 3-D as it gears up to boost TV sales with that technology, Chief Executive Howard Stringer ...
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