Podcast
Questions and Answers
What triggers the secretion of parathyroid hormone (PTH)?
What triggers the secretion of parathyroid hormone (PTH)?
- Stable ionized Ca2+ levels
- An increase in ionized Ca2+ levels
- The presence of calcitonin
- A decrease in ionized Ca2+ levels (correct)
Which of the following processes does PTH stimulate in the bone?
Which of the following processes does PTH stimulate in the bone?
- Bone mineralization
- Bone remodeling
- Bone resorption (correct)
- Bone synthesis
What action does PTH have in the kidneys?
What action does PTH have in the kidneys?
- Increases tubular reabsorption of Ca2+ ions (correct)
- Reduces phosphate reabsorption
- Promotes calcium excretion
- Inhibits vitamin D production
Which hormone is involved in the regulation of serum calcium levels along with PTH?
Which hormone is involved in the regulation of serum calcium levels along with PTH?
What is the primary effect of PTH on bone tissue?
What is the primary effect of PTH on bone tissue?
Flashcards
Parathyroid Hormone (PTH)
Parathyroid Hormone (PTH)
A hormone secreted by the parathyroid glands that regulates calcium levels in the blood.
Bone Resorption
Bone Resorption
PTH's action of breaking down bone and releasing calcium into the bloodstream.
Calcium Reabsorption
Calcium Reabsorption
PTH's effect on the kidneys to increase the reabsorption of calcium, preventing it from being excreted.
Active Vitamin D
Active Vitamin D
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Calcitonin
Calcitonin
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Study Notes
Calcium Regulation
- Three hormones—parathyroid hormone (PTH), vitamin D, and calcitonin—control serum calcium (Ca2+) levels. Their secretion changes based on ionized Ca2+ levels.
- PTH secretion is triggered by reduced ionized Ca2+. Conversely, increased ionized Ca2+ stops PTH secretion.
- PTH influences bone and kidney function.
- In bone, PTH activates bone resorption, where osteoclasts break down bone, releasing Ca2+ into the extracellular fluid (ECF).
- In the kidneys, PTH promotes tubular reabsorption of Ca2+, saving Ca2+
- PTH also prompts the kidneys to make active vitamin D.
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Description
This quiz explores the role of key hormones in calcium regulation, focusing on parathyroid hormone (PTH), vitamin D, and calcitonin. Understand how these hormones respond to changes in ionized calcium levels and their effects on bone and kidney function. Test your knowledge on the processes involved in calcium homeostasis.
