Thyroxin

Thyroxine, also known as T4, is a type of hormone that is produced and released by the thyroid gland. It plays a crucial role in heart and digestive function, metabolism, brain development, bone health, and muscle control.

Production and Function

Thyroxine is produced by the follicular cells of the thyroid gland. The production is stimulated by the thyroid-stimulating hormone (TSH), which is released by the pituitary gland. The process involves the iodination of the amino acid tyrosine, followed by the coupling of iodotyrosines.

The primary function of thyroxine is to stimulate the consumption of oxygen and thus the metabolism of all cells and tissues in the body. It also plays a role in maintaining the body's basal metabolic rate.

Medical Significance

Abnormal levels of thyroxine can lead to several medical conditions. Hyperthyroidism is a condition characterized by excessive production of thyroxine, leading to a high metabolic rate, sweating, rapid heart rate, and weight loss. On the other hand, hypothyroidism is a condition where the thyroid gland does not produce enough thyroxine, leading to fatigue, weight gain, depression, and slow heart rate.

See Also

• Triiodothyronine
• Thyroid function tests
• Thyroid disease

References

Thyroxin Resources
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