Sports medicine & Kinesiology

Heat stress may affect the muscles for longer than we think

People who experience heat stress during exercise may need more recovery time to let their muscles heal, according to a new mouse study published ahead of print in the American Journal of Physiology-Regulatory, Integrative ...

Health

This is how tobacco damages our cells

My father smoked a pipe for some time, and I vividly remember that sticky black substance—tar—which stuck to the device's filter. Now imagine this stuff going into your lungs, and coating their walls. The picture is unpleasant, ...

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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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