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

Which hormone is responsible for lowering blood calcium levels?

Aldosterone

Calcitonin

Cortisol

Parathyroid hormone

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Verified step by step guidance

Step 1: Understand the role of calcium regulation in the body. Blood calcium levels are tightly regulated by hormones to maintain homeostasis, as calcium is essential for processes like muscle contraction, nerve signaling, and bone health.

Step 2: Identify the hormones listed in the problem and their primary functions. Aldosterone regulates sodium and potassium balance, cortisol is involved in stress response and metabolism, and parathyroid hormone increases blood calcium levels by stimulating bone resorption and calcium absorption in the intestines.

Step 3: Learn about calcitonin, which is secreted by the thyroid gland. Calcitonin lowers blood calcium levels by inhibiting osteoclast activity (cells that break down bone tissue) and promoting calcium deposition in bones.

Step 4: Compare the functions of the listed hormones. Calcitonin is the only hormone among the options that directly lowers blood calcium levels, while parathyroid hormone has the opposite effect, increasing blood calcium levels.

Step 5: Conclude that calcitonin is the hormone responsible for lowering blood calcium levels, based on its physiological role in calcium homeostasis.