Diabetes

Insulin under the influence of light

The disruption of internal clocks seems to play a significant role in the explosion of metabolic diseases observed in recent decades, particularly diabetes. Scientists have improved understanding of the importance of day-night ...

Health

Researchers document impact of coffee on bowels

Coffee drinkers know that coffee helps keep the bowels moving, but researchers in Texas are trying to find out exactly why this is true, and it doesn't seem to be about the caffeine, according to a study presented at Digestive ...

Sports Medicine & Kinesiology

Stiff muscles are a counterintuitive superpower of NBA athletes

For most people, the term "stiffness" has negative connotations. When you wake up in the morning complaining of a "stiff back," the remedy might include taking a hot shower, doing some yoga, swallowing aspirin, or visiting ...

Health

Pelvic exercises may beat bedroom blues

Physiotherapists from James Cook University in Australia say simple pelvic floor exercises may be a cure for some common problems men experience in the bedroom.

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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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