Medical Conditions Terminology in Category S

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Sodium-Calcium Antiporter

An electrogenic ion exchange protein that maintains a steady level of calcium by removing an amount of calcium equal to that which enters the cells. It is widely distributed in most excitable membranes, including the brain and heart.

Sodium-Hydrogen Antiporter

A plasma membrane exchange glycoprotein transporter that functions in intracellular pH regulation, cell volume regulation, and cellular response to many different hormones and mitogens.

Sodium-Proton Antiporter

A plasma membrane exchange glycoprotein transporter that functions in intracellular pH regulation, cell volume regulation, and cellular response to many different hormones and mitogens.

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Southeastern Asia

The geographical area of Asia comprising BORNEO; BRUNEI; CAMBODIA; INDONESIA; LAOS; MALAYSIA; the MEKONG VALLEY; MYANMAR (formerly Burma), the PHILIPPINES; SINGAPORE; THAILAND; and VIETNAM.

Spastic Aphonia

Complete loss of phonation due to organic disease of the larynx or to nonorganic (i.e., psychogenic) causes.

Spectrum Analysis

The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Speech Articulation Disorder

Disorders of the quality of speech characterized by the substitution, omission, distortion, and addition of phonemes.

Speech Audiometry

Measurement of the ability to hear speech under various conditions of intensity and noise interference using sound-field as well as earphones and bone oscillators.

Sperm Bank

Centers for acquiring and storing semen.

Spinal Arthritis

Arthritis of the spine, specifically involving the intervertebral articulations.