Webster's New World Medical Dictionary

synovia
410
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systemic lupus erythematosis
See 
lupus ery-
thematosis, systemic.
systemic therapy
Treatment that reaches cells
throughout the body by traveling through the blood-
stream.
systemic-onset juvenile chronic arthritis
See
arthritis, systemic-onset juvenile rheumatoid.
systemic-onset juvenile rheumatoid arthritis
See 
arthritis, systemic-onset juvenile rheuma-
toid.
systolic
Referring to the time at which ventricular
contraction occurs, which is called systole. Systolic
pressure is the maximum arterial pressure during
contraction of the left ventricle of the heart. In a
blood pressure reading, the systolic pressure is typ-
ically the first number recorded. For example, in a
blood pressure of 120/80 (“120 over 80”), the sys-
tolic pressure is 120 (that is, 120 mm Hg [millime-
ters of mercury]). A systolic murmur is a heart
murmur heard during systole. See also 
diastolic.
411
systolic
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t
In genetics, translocation.
T
Thymine, one member of the adenine-thymine
(A-T) base pair in DNA.
T cell
A type of white blood cell that is made in
the bone marrow and migrates to the thymus gland,
where it matures, differentiates into various types of
T cells, and becomes active in the immune system.
There are several types of mature T cells. Most of
the T cells in the body belong to one of two subsets
known as T-4 cells and T-8 cells. T-8 cells are cyto-
toxic T lymphocytes that can produce cytokines,
such as the interleukins, which in turn further stim-
ulate the immune response. T-cell activation is
measured to assess the health of patients with HIV.
Also known as T lymphocyte. See also 
natural killer
cell; T-4 cell; T lymphocyte, cytotoxic; T-suppres-
sor cell.