Medical research

Aging really is 'in your head'

Among scientists, the role of proteins called sirtuins in enhancing longevity has been hotly debated, driven by contradictory results from many different scientists. But new research at Washington University School of Medicine ...

Cardiology

How to trick your heart into thinking you exercise

Researchers have discovered that a protein called cardiotrophin 1 (CT1) can trick the heart into growing in a healthy way and pumping more blood, just as it does in response to exercise and pregnancy. They show that this ...

Medical research

Scientist identify first steps in muscle regeneration

Scientists from Monash University's Australian Regenerative Medicine Institute ARMI have found the first real evidence of how muscles may be triggered to regenerate or heal when damaged. The research could open the way to ...

Medical research

New collagen patch speeds repair of damaged heart tissue in mice

You can't resurrect a dead cell anymore than you can breathe life into a brick, regardless of what you may have gleaned from zombie movies and Dr. Frankenstein. So when heart cells die from lack of blood flow during a heart ...

Medical research

Stem cell study may result in stronger muscles in old age

Muscular function declines with age. A new study by researchers at Karolinska Institutet in Sweden shows how an unexpectedly high number of mutations in the stem cells of muscles impair cell regeneration. This discovery may ...

Cardiology

A sobering conclusion: Adult hearts contain no stem cells

A detailed cell-by-cell map of all dividing cells in the adult murine heart before and after myocardial infarction was created using advanced molecular and genetic technologies in a combined research effort led by Hans Clevers ...

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Muscle

Muscle (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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