Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Synthesis: Putting together different entities to make a whole which is new and different. In biochemistry, synthesis refers specifically to the process of building compounds from more elementary substances by means of one or more chemical reactions.
For example, the adipocyte is a cell that is spe...
Synuclein: A family of structurally related proteins that are prominently expressed in the central nervous system. See: Alpha-synuclein....
Syphilis: A sexually transmitted disease caused by
Treponema pallidum, a microscopic organism called a spirochete. This
worm-like, spiral-shaped organism infects people by burrowing into
the moist mucous membranes of the mouth or genitals. From there, the
spirochete produces a non-painful ulcer ...
Syphilis test (FTA-ABS)
Syphilis test (FTA-ABS): The fluorescent treponemal antibody absorbed (FTA-ABS) test for syphilis is a blood serum screening test designed to demonstrate the presence or absence of specific antibodies directed against the organism (Treponema pallidum) responsible for syphilis. The test detects the ...
Syphilis test, RPR
Syphilis test, RPR: Rapid plasma reagin, a blood test for
syphilis that looks for an antibody that is present in the
bloodstream when a patient has syphilis. A negative (nonreactive)
RPR is compatible with a person not having syphilis, but in the early
stages of the disease, the RPR often gives ...
Syphilis test, VDRL
Syphilis test, VDRL: A blood test for syphilis (VDRL stands
for Venereal Disease Research Laboratory) that detects an antibody
that is present in the bloodstream when a patient has syphilis. A
negative (nonreactive) VDRL is compatible with a person not having
syphilis, but in the early stages of...
Syphilis, congenital: Infection of a fetus or
newborn with syphilis. Syphilis in a fetus can cause
deformity, particularly of the long bones, or death.
Syphilis infection acquired at birth is also dangerous. See
also TORCH infection....
Syphilis, tertiary: The third stage of
syphilis, in which the syphilis spirochetes infect the
brain and other organs of the body. Dementia is a common
outcome. Tertiary syphilis can develop many years after an
initial untreated infection. The spirochetes can cause
extensive damage in the body,...
Syphilitic: 1. Relating to syphilis, caused by it, or suffering from it.
2. A person with syphilis. From the French syphilitique....
Syringe: A device used in medicine to inject fluid into or
withdraw fluid from the body. Medical syringes consist of a needle
attached to a hollow cylinder that is fitted with a sliding plunger.
The downward movement of the plunger injects fluid; upward movement
Syringoma: A benign (non-cancerous) skin tumor that derives
from eccrine cells, specialized cells that are related to sweat
glands. The skin lesions usually appear during puberty or adult life,
and consist of small bumps one to three millimeters in diameter that
form underneath the surface of th...
System, autonomic nervous
System, autonomic nervous: Part of the nervous
that was once thought to be functionally independent of the brain.
The autonomic nervous system regulates key functions of the body
including the activity of the heart muscle (see below), the smooth
muscles (e.g., the muscles of the intesti...
System, cardiac conduction
System, cardiac conduction: The electrical conduction system that controls the heart rate. This system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood.
Among the major elements in the cardiac conduction system are ...
System, cardiovascular: The circulatory system which
comprises the heart and blood vessels. The system carries nutrients and oxygen to the tissues of the body and removes carbon dioxide and other wastes from them.
The cardiovascular system is a closed tubular system in which the blood is propelled...
System, central nervous (CNS)
System, central nervous (CNS): That part of the nervous system that consists of the brain and spinal cord.
The central nervous system (CNS) is one of the two major divisions of the nervous system. The other is the peripheral nervous system (PNS), that part of the nervous system that lies outside t...