Increases the metabolic rate of all cells and regulates growth and development.

Controlled by the nervous system (Sympathetic) rather than hormones.

Small amounts of sex hormones (estrogen/testosterone). Adrenal Medulla (Öz Bölümü)

Lowers blood calcium levels by promoting calcium storage in bones and reducing absorption in the kidneys. 2. Parathyroid Gland (Paratiroit Bezi) Four tiny glands located on the back of the thyroid. Parathormone (PTH):

Works in direct opposition to Calcitonin to maintain calcium homeostasis. 3. Adrenal Glands (Böbrek Üstü Bezleri)

This guide provides a structured overview of the , specifically focusing on the thyroid, parathyroid, and adrenal (bobrek üstü) glands, as outlined in common Turkish secondary or higher education biology curricula. 1. Thyroid Gland (Tiroit Bezi)