Urinary loss of `Na^(+)` is reduced by the hormone __________ while the `Ca^(2+)` concentration is raised in the plasma by ______

Answer

To solve the question regarding the hormones that regulate sodium and calcium levels in the body, we can break it down into two parts.

**Step 1: Identify the hormone that reduces urinary loss of Na⁺.**
- The hormone responsible for reducing the urinary loss of sodium ions (Na⁺) is **aldosterone**. Aldosterone is a mineralocorticoid hormone secreted by the adrenal cortex. It acts on the kidneys to promote sodium reabsorption, which helps to retain sodium in the body and reduce its loss through urine.

**Step 2: Identify the hormone that raises Ca²⁺ concentration in the plasma.**
- The hormone that raises the concentration of calcium ions (Ca²⁺) in the plasma is the **parathyroid hormone (PTH)**. This hormone is secreted by the parathyroid glands and works by acting on the bones, kidneys, and intestines to increase calcium levels in the blood.

**Final Answer:**
- Urinary loss of Na⁺ is reduced by the hormone **aldosterone**, while the Ca²⁺ concentration is raised in the plasma by **parathyroid hormone (PTH)**.

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