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   The active form of T4 synthesized in the peripheral tissue.


At or near the surface of the body. Located away from the center structure.

Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.



The gland in the throat that synthesizes thyroid hormones that affect metabolism.

Thyroid-Releasing Hormone (TRH)
The hormone released from the hypothalamus. It instructs the pituitary to release TSH.

Thyroid-Stimulating Hormone (TSH)
The hormone released from the pituitary that causes the thyroid gland to produce T4 hormone. TSH uses the second messenger cyclic AMP to initiate the synthesis of T4.

Triglycerides (TG)
The form of fat found in various lipoproteins in the bloodstream. High levels of triglycerides are usually indicative of high levels of insulin. The ratio of TG/HDL is a powerful indicator of insulin levels and is strongly predictive of future cardiovascular events.

Type 2 Diabetes
A diabetic condition characterized by the overproduction of insulin (hyperinsulinemia), increased AGE production, and decreased longevity.


The thyroid hormone that is released from the thyroid gland in response to TSH, which generates cyclic AMP.

The trachea is a tube which extends from the larynx to the esophagus. It is connected to the trachea at about the area where the larynx is located. It functions as a tube for air to pass through from the external environment to the lungs. It is composed of C-shaped cartilage rings which are embedded in the smooth muscle. The cartilage prevents the trachea from collapsing and closing off the airway.

A condition in which a blood clot fragment breaks off from one part of the body and blocks a blood vessel in another part of the body.

Various rhythmic involuntary movements involving the arms, legs or head, occurring in numerous illnesses and conditions and greatly varying in type and severity.

Tunnel vision
Lack of a high-level view of a hypermedia system. Tunnel vision is caused by, among other things, information being presented in small fragments not related to their context. The opposite to world vision.

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