How do the endocrine system and kidneys regulate blood pressure? This condition causes the heart to beat too fast, with all the related problems that this may cause it can also cause weight loss even though people feel like they are eating more than usual. An excess of thyroid hormone is called hyperthyroidism. A decrease in production of either hormone can lead to hypothyroidism - not enough hormone to trigger metabolic activity in all parts of the body. Thus, both T4 and T3 are required for normal cell function. T3 has less effect on cells than does T4 but it increases the sensitivity of target tissues to T4. T4 is the major hormone produced by the thyroid gland it binds to receptor sites on cells, triggering an increase in metabolism and growth. The thyroid gland produces two hormones: T4 and T3. The primary function of the thyroid gland is to regulate its own activity through a feedback mechanism that involves thyroid-stimulating hormone (TSH) and thyroxine (T4). It does this by binding to receptors on cells all over the body, causing them to absorb more salt from the urine and release more potassium into the blood. A mineralocorticoid hormone released by the adrenal cortex that maintains the sodium and potassium balance in the body.
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