HIV & AIDS

Study reveals accelerated aging in women living with HIV

Women with HIV experience accelerated DNA aging, a phenomenon that can lead to poor physical function, according to a study led by Stephanie Shiau, an assistant professor in the Department of Biostatistics and Epidemiology ...

Gerontology & Geriatrics

Video: Aging and the benefits of exercising

Exercising as you age can be challenging. Sometimes it can feel like your body is breaking down. One possible reason for this could be senescent cells, which build up in your body as you get older and contribute to age-related ...

Gerontology & Geriatrics

Impacts during everyday physical activity can slow bone loss

A study conducted at the University of Jyväskylä, Finland, found that the bone mineral density at the femoral neck decreased, but the structural properties were maintained or even slightly improved during a year-long multicomponent ...

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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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