Hormone, thyroxine
A chemical substance made by the thyroid gland The thyroid gland uses iodine to make thyroid hormones. Thyroxine (T4), one of the most important thyroid hormones, has four iodine molecules attached to its molecular structure.
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- Hormone, triiodothyronine
A hormone made by the thyroid gland. It has three iodine molecules attached to its molecular structure. Iodine is naturally found in seafood, bread, seaweed, and ordinary table salt. Triiodothyronine is the most powerful thyroid hormone, and affects almost every process in the body, including body temperature, growth, and heart rate. Also known as T3, […]
- Hormone, TSH
Stands for Thyroid Stimulating Hormone. Also known as thyrotropin.
- Horner syndrome
A condition resulting from interruption of the sympathetic nerve pathways to the eye, resulting in the drooping of the upper eyelid on one same side (ptosis), the constriction of the pupil of that eye (miosis), and with the lack of sweating (anhidosis) and flushing of the affected side of the face. Also known as Horner-Bernard […]
- Hornet sting
A sting from a hornet, which can trigger an allergic reaction of varying severity. Avoidance and prompt treatment are essential. For those with severe reactions, injectable epinephrine should always be kept on hand. In selected cases, allergy injection therapy is highly effective.
- Horripilation
Better known as goose bumps, a temporary local change in the skin when it becomes rougher due to erection of little muscles, as from cold, fear, or excitement. The chain of events leading to this skin change starts with a stimulus such as cold or fear. That stimulus causes a nerve discharge from the sympathetic […]