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.
The basic unit of the thyroid gland is the follicle. The thyroid gland captures dietary iodine, synthesizes thyroid hormone from it, and stores thyroid hormone until it is needed. Colloid, the material in the center of the follicles, stores thyroid hormone in a large protein called thyroglobulin.he basic unit of the thyroid gland is the follicle. The thyroid gland captures dietary iodine, synthesizes thyroid hormone from it, and stores thyroid hormone until it is needed. Colloid, the material in the center of the follicles, stores thyroid hormone in a large protein called thyroglobulin.