Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
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 Blood3h 22m
18. The Heart3h 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 Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

16. The Endocrine System

Introduction to the Endocrine System

Anatomy & Physiology

16. The Endocrine System

Introduction to the Endocrine System

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Multiple Choice

What stimulates the secretion of parathyroid hormone from the parathyroid gland?

Low blood glucose levels

Low blood calcium levels

High blood glucose levels

High blood calcium levels

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Verified step by step guidance

Understand the role of parathyroid hormone (PTH): PTH is crucial for regulating calcium levels in the blood. It increases blood calcium levels by stimulating osteoclasts to break down bone and release calcium, increasing calcium reabsorption in the kidneys, and activating vitamin D to increase intestinal absorption of calcium.

Identify the stimulus for PTH secretion: The primary stimulus for the secretion of parathyroid hormone is low blood calcium levels. This is detected by calcium-sensing receptors on the parathyroid glands.

Differentiate between calcium and glucose regulation: Note that glucose levels are regulated by insulin and glucagon, not by parathyroid hormone. Therefore, changes in blood glucose levels do not directly affect PTH secretion.

Consider the physiological response: When blood calcium levels drop, the parathyroid glands secrete more PTH to restore calcium balance. Conversely, high blood calcium levels would inhibit PTH secretion.

Conclude the correct stimulus: Based on the understanding of PTH function and regulation, low blood calcium levels are the correct stimulus for the secretion of parathyroid hormone from the parathyroid gland.