Brush Construction. 1  Selected hairs are separated into small piles. Each pile is combed to remove curled or cut hairs. 2  Hair piles are bundled, wrapped in newspaper and tied with string. The hair bundle is boiled in water to remove oils and straighten the hair. 3  A single brush can contain several different hair lengths.
1 The thyroid gland plays a primary role in your energy level, muscle growth, metabolic rate, and brain function. 2  Hypothyroidism is a common disorder in which the bodyâs ability to produce enough thyroid hormone is insufficient.hyroid Hormones. 1  The thyroid gland plays a primary role in your energy level, muscle growth, metabolic rate, and brain function. 2  Hypothyroidism is a common disorder in which the bodyâs ability to produce enough thyroid hormone is insufficient.
Your thyroid gland makes two hormones: thyroxine (also called T4) and triiodothyronine (also called T3). Together, these hormones regulate your body's growth and metabolism. Your metabolism is how quickly your body burns energy and how quickly reactions in your body happen.