The hormone that increases blood calcium levels is parathormone.
Parathormone, also known as parathyroid hormone (PTH), plays a vital role in regulating calcium levels in the blood. When blood calcium levels drop too low, the parathyroid glands release parathormone. This hormone then acts on several target organs to increase calcium concentrations back to normal.
Here's a breakdown of how parathormone elevates blood calcium:
- Bone Resorption: PTH stimulates osteoclasts, cells that break down bone tissue, releasing calcium into the bloodstream.
- Kidney Reabsorption: Parathormone acts on the kidneys to reduce the amount of calcium excreted in urine, increasing the amount reabsorbed back into the blood.
- Intestinal Absorption: Indirectly, PTH increases the absorption of calcium from the intestines by activating vitamin D.
Therefore, parathormone is the primary hormone responsible for elevating blood calcium levels.
| Hormone | Primary Function | Effect on Blood Calcium |
|---|---|---|
| Parathormone | Increases blood calcium, decreases calcium excretion by kidneys. | Increases |
