The thyroid gland is unique because:
1. It is the only gland in our body with specialized cells capable of absorbing iodine and converting it into hormones.
2. The thyroid gland is the only endocrine gland that stores its secretions for around 90-100 days.
3. The thyroid gland is the largest endocrine gland of the body.
4. The thyroid gland causes both the formation and breakdown of ATP through its thermogenic and calorigenic effects.