Thyroid and parathyroid glands

Thyroid and parathyroid are two endocrine glands in the animal body. The thyroid gland is a butterfly-shaped gland, which lies in front of the trachea, just below the larynx. Though it does not possess any functional relationship with the thyroid gland, parathyroid glands are physically attached to the capsule of the thyroid gland at its posterior side. Since they are endocrine glands, both thyroid and parathyroid glands produce hormones that belong to the endocrine system of the body. The main difference between thyroid and parathyroid is that thyroid produces hormones that regulate the metabolism of the body whereas parathyroid produces hormones that control the calcium ion levels in the blood