Thyroxine
and triiodothyronine are tyrosine-based hormones produced by the thyroid gland. An important component in the synthesis of thyroid hormones is iodine. The thyronines act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone), neuronal maturation and increase the body’s sensitivity to catecholamines (such as adrenaline) by permissiveness.
The thyronines act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone), neuronal maturation and increase the body’s sensitivity to catecholamines (such as adrenaline) by permissiveness.
The thyroid
hormones are essential to proper development and differentiation of all cells of the human body. These hormones also regulate protein, fat, and carbohydrate metabolism, affecting how human cells use energetic compounds. They also stimulate vitamin metabolism. Numerous physiological and pathological stimuli influence thyroid hormone synthesis.
Effects of thyroxine:
- Increases cardiac output
- Increases heart rate
- Increases ventilation rate
- Increases basal metabolic rate
- Potentiates the effects of catecholamines (i.e increases sympathetic activity)
- Potentiates brain development
- Thickens endometrium in females
Thyroid hormones are usually not dangers for pregnant women or nursing mothers, but should be given a doctor’s supervision. One exception is that thyroid hormones may aggravate heart conditions, especially in older patients; therefore, doctors may start these patients on a lower dose & work up to avoid risk of heartattack.
Source: http://www.thyroid-guide.org/top-thyroid-supplements/
