The parathyroid gland secretes parathormone. This hormone increases the blood calcium level.
In case of its deficiency, the blood plasma levels of calcium fall significantly. As a result, the nerve cells reaching the muscles cause frequent stimulation in muscles, leading to the sustained contraction of muscles of feet, hands, larynx, etc., which is called muscular tetany.
- The parathyroid glands are important in tightly controlling calcium levels in the bloodstream.
- The parathyroid glands are small pea-sized glands located in the neck just behind the butterfly-shaped thyroid gland.
- The main target organs where parathyroid hormone exerts its effects are the bones and the kidneys.
- The hormone is secreted in response to low blood calcium levels, and its effect is to increase those levels.