Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Free Tools

Explore our collection of AI-powered tools designed to boost your productivity.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing Schools Business

Features Free Tools Pricing Schools Business

5 Questions

2 Views

Calcium Regulation Hormones Quiz

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary effect of PTH on the kidneys?

Reduces reabsorption of calcium ions

Increases tubular secretion of sodium

Increases tubular reabsorption of calcium ions (correct)

Lowers phosphate reabsorption

What triggers the secretion of PTH in the blood?

Decrease in ionized Ca2+ levels (correct)

Increase in vitamin D levels

Increase in ionized Ca2+ levels

Decrease in calcitonin levels

What process does PTH activate in the bone?

Calcification of bone

Bone resorption (correct)

Bone remodeling without resorption

Bone formation

Which of the following hormones is NOT involved in regulating serum Ca2+ levels?

<p>Insulin (A)</p> Signup and view all the answers

What is one of the actions of PTH in relation to vitamin D?

<p>Stimulates renal production of active vitamin D (A)</p> Signup and view all the answers

Flashcards

Parathyroid Hormone (PTH)

A hormone that increases blood calcium levels by stimulating bone resorption (breaking down bone to release calcium), increasing calcium reabsorption in the kidneys, and activating vitamin D.

Calcitonin

A hormone that decreases blood calcium levels by inhibiting bone resorption and stimulating calcium excretion in the kidneys.

Bone Resorption

A process where bone tissue is broken down by osteoclasts, releasing calcium into the bloodstream.

Vitamin D

A hormone that increases blood calcium levels by promoting calcium absorption in the intestines.

Signup and view all the flashcards

Calcium Homeostasis

The regulation of blood calcium levels, primarily controlled by PTH, calcitonin, and vitamin D.

Signup and view all the flashcards

Study Notes

Calcium Regulation Hormones

Three hormones regulate serum calcium (Ca2+): parathyroid hormone (PTH), vitamin D, and calcitonin.
These hormones adjust secretion according to ionized Ca2+ levels.
PTH release is triggered by low ionized Ca2+ and inhibited by high levels.

PTH Effects

PTH significantly influences bone and kidneys.
In bone, PTH activates osteoclasts, leading to bone resorption and Ca2+ release into the extracellular fluid (ECF).
In kidneys, PTH promotes Ca2+ reabsorption in the tubules.
PTH also stimulates the kidneys to produce active vitamin D.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge on the hormones that regulate serum calcium, including parathyroid hormone, vitamin D, and calcitonin. Explore their effects on bones and kidneys, and understand how they respond to ionized calcium levels. This quiz will challenge your understanding of calcium homeostasis.