Question
Which of the following is not one of the effects of the parathyroid hormone (PTH)? increased calcium absorption in the small intestine increased blood calcium concentration increased calcium reabsorption in the kidneys increased calcium storage in bones
Ask by Henry Cruz. in the United States
Jan 25,2025
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Answer
Increased calcium storage in bones is not an effect of PTH.
Solution
The parathyroid hormone (PTH) plays a crucial role in regulating calcium levels in the blood. Here's how PTH affects calcium in different parts of the body:
1. **Increased Calcium Absorption in the Small Intestine**: PTH indirectly increases calcium absorption in the intestines by stimulating the production of active vitamin D (calcitriol), which enhances the efficiency of calcium uptake from the diet.
2. **Increased Blood Calcium Concentration**: One of the primary functions of PTH is to raise blood calcium levels. It does this by stimulating the release of calcium from bones, increasing calcium reabsorption in the kidneys, and enhancing intestinal absorption.
3. **Increased Calcium Reabsorption in the Kidneys**: PTH acts on the kidneys to reduce the excretion of calcium, thereby increasing its reabsorption back into the bloodstream.
4. **Increased Calcium Storage in Bones**: **This is not an effect of PTH.** In fact, PTH **decreases** calcium storage in bones by stimulating osteoclasts to break down bone tissue, releasing calcium into the blood.
**Therefore, the effect that is NOT associated with PTH is:**
**Increased calcium storage in bones**
Reviewed and approved by the UpStudy tutoring team
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Simplify this solution The Deep Dive
Parathyroid hormone (PTH) is a key player in calcium homeostasis and actually triggers the release of calcium from the bone into the bloodstream, rather than increasing calcium storage in bones. It typically acts to raise blood calcium levels through various mechanisms, making it essential for maintaining the balance required for physiological functions. While PTH works diligently to keep blood calcium levels up, it’s also important to note that sustained high levels can lead to issues like hypercalcemia. This emphasizes the crucial need for balance—too much calcium can be just as troublesome as too little! Always remember, when it comes to hormones and minerals, moderation is key!
