Question

The hormone that increases the blood calcium level and decreases its excretion by kidney is

• A. Parathormone
• B. Calcitonin
• C. Thyroxine
• D. Insulin

Answer 1

The correct option is A Parathormone

Parathormone or parathyroid hormone is secreted from parathyroid glands. Parathormone plays an important role in the calcium balance of the body. It maintains the calcium balance between the blood and the other tissues. When the calcium level in the blood decreases, parathyroid hormone is released in order to increase the calcium level in the blood. It acts on bones and other skeletal structures and mobilizes the calcium ($C{a}^{2+}$) from the bones into the blood. This is called bone resorption. The parathormone also increases the reabsorption of calcium by the renal tubules and absorption of calcium from the digested food. It decreases excretion of calcium by the kidney.