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

PTH is a hormone released by the parathyroid glands in response to which of the following?

Low blood calcium levels

High blood calcium levels

High blood glucose levels

Low blood glucose levels

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Verified step by step guidance

Identify the role of PTH (Parathyroid Hormone) in the body. PTH is primarily involved in the regulation of calcium levels in the blood.

Understand the physiological trigger for the release of PTH. The parathyroid glands release PTH in response to changes in blood calcium levels.

Recall that PTH is released when blood calcium levels are low. This is because PTH acts to increase blood calcium levels by stimulating bone resorption, increasing intestinal calcium absorption, and promoting renal calcium reabsorption.

Eliminate the incorrect options based on the function of PTH. High blood calcium levels would not trigger PTH release, as PTH works to increase calcium levels. Similarly, blood glucose levels are not directly regulated by PTH.

Conclude that the correct condition for the release of PTH is low blood calcium levels, as this aligns with the hormone's role in maintaining calcium homeostasis.