Final answer:
The consequence of the action of parathyroid hormone (PTH) on the kidneys is: 3) Calcium excretion and phosphorus reabsorption. Parathyroid hormone plays a crucial role in calcium and phosphorus homeostasis.
Step-by-step explanation:
The consequence of the action of parathyroid hormone (PTH) on the kidneys is: 3) Calcium excretion and phosphorus reabsorption. Parathyroid hormone plays a crucial role in calcium and phosphorus homeostasis. In response to low blood calcium levels, the parathyroid glands release PTH. PTH acts on the kidneys to enhance the reabsorption of calcium, preventing its loss in the urine (calcium reabsorption). Simultaneously, PTH inhibits the reabsorption of phosphorus, leading to increased phosphorus excretion in the urine (phosphorus excretion). These actions help elevate blood calcium levels while maintaining appropriate levels of phosphorus in the body, contributing to overall mineral balance.