General

General

General nature or nature terms.

Industry: Natural environment

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General

sinoatrial (SA) node

Biology; General

A region of modified muscle cells in the right atrium that sends timed impulses to the heart's other muscle cells, causing them to contract; the heart's pacemaker.

sudden infant death syndrome (SIDS)

A disorder resulting in the unexpected death during sleep of infants, usually between the ages of two weeks and one year. The causes are not fully understood, but are believed to involve failure of ...

scrotum

Biology; General

In mammals, a pouch of skin located outside the body cavity into which the testes descend; provides proper temperature for the testes.

sister chromatids

Biology; General

Chromatids joined by a common centromere and carrying identical genetic information (unless crossing-over has occurred).

superior vena cava

Biology; General

Blood from the head returns to the heart through this main vein.

skeletal muscle

Biology; General

Muscle that is generally attached to the skeleton and causes body parts to move; consists of muscle fibers. Voluntary muscle cells that have a striated appearance. These muscles control skeletal ...