🦊 In this GCSE Biology video, we explain that thyroxine, a hormone produced by the thyroid gland in the neck, is regulated by the pituitary gland through thyroid stimulating hormone (TSH). Thyroxine's primary functions include regulating the basal metabolic rate and playing a crucial role in growth and development, influencing the growth of tissues and organs like bones and the brain. The body maintains thyroxine levels using negative feedback, where the brain detects thyroxine levels to adjust TSH release, ensuring thyroxine levels are kept within an optimum range.

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