Table of contents

1. Introduction to Anatomy & Physiology5h 40m
2. Cell Chemistry & Cell Components12h 37m
3. Energy & Cell Processes10h 7m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood1h 22m
18. The Heart1h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance Coming soon
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity Coming soon

6. Bones & Skeletal Tissue

Microscopic Anatomy of Bones - Bone Cells

Anatomy & Physiology

6. Bones & Skeletal Tissue

Microscopic Anatomy of Bones - Bone Cells

2:17 minutes

Problem 17b

Textbook Question

Which three organs or tissues interact to assist in the regulation of calcium ion concentration in body fluids?

Verified step by step guidance

Identify the primary organs and tissues involved in calcium regulation: the bones, kidneys, and parathyroid glands.

Understand the role of bones: Bones store calcium and can release it into the bloodstream when needed.

Examine the function of the kidneys: The kidneys filter blood and can reabsorb calcium, preventing its loss in urine.

Explore the role of the parathyroid glands: These glands secrete parathyroid hormone (PTH), which regulates calcium levels by acting on bones, kidneys, and the intestines.

Consider the interaction between these organs: PTH increases calcium release from bones, enhances calcium reabsorption in the kidneys, and stimulates the production of active vitamin D, which increases calcium absorption in the intestines.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Parathyroid Hormone (PTH)

Parathyroid hormone is secreted by the parathyroid glands and plays a crucial role in regulating calcium levels in the blood. When calcium levels drop, PTH is released, stimulating the release of calcium from bones, increasing calcium reabsorption in the kidneys, and promoting the activation of vitamin D, which enhances intestinal absorption of calcium.

Calcitonin

Calcitonin is a hormone produced by the thyroid gland that helps lower blood calcium levels. It acts by inhibiting osteoclast activity in bones, which reduces the release of calcium into the bloodstream, and by promoting calcium excretion in the kidneys. This hormone works in opposition to PTH, maintaining calcium homeostasis.

Vitamin D

Vitamin D is essential for calcium absorption in the intestines and plays a significant role in maintaining calcium and phosphate balance in the body. It is synthesized in the skin upon exposure to sunlight and can also be obtained from dietary sources. Active vitamin D (calcitriol) enhances the intestinal absorption of calcium, thus contributing to the regulation of calcium ion concentration in body fluids.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. Bone resorption is triggered by pressure placed on the bone.