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

1. Introduction to Anatomy & Physiology

Feedback Loops

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Feedback Loops

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Multiple Choice

How do the thyroid and parathyroid glands form a feedback loop in the regulation of calcium levels in the blood?

The thyroid gland releases thyroxine to increase blood calcium levels, while the parathyroid glands release calcitonin to decrease blood calcium levels.

The thyroid gland releases calcitonin to lower blood calcium levels, while the parathyroid glands release parathyroid hormone to increase blood calcium levels.

The thyroid gland releases parathyroid hormone to increase blood calcium levels, while the parathyroid glands release thyroxine to decrease blood calcium levels.

The thyroid gland releases calcitonin to increase blood calcium levels, while the parathyroid glands release thyroxine to decrease blood calcium levels.

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Verified step by step guidance

Identify the primary hormones involved in calcium regulation: calcitonin and parathyroid hormone (PTH).

Understand the role of the thyroid gland: it releases calcitonin, which helps to lower blood calcium levels by inhibiting osteoclast activity and promoting calcium deposition in bones.

Understand the role of the parathyroid glands: they release parathyroid hormone (PTH), which increases blood calcium levels by stimulating osteoclast activity, increasing intestinal calcium absorption, and promoting renal calcium reabsorption.

Recognize the feedback loop: when blood calcium levels are high, the thyroid gland releases calcitonin to decrease calcium levels. Conversely, when blood calcium levels are low, the parathyroid glands release PTH to increase calcium levels.

Clarify the incorrect statements: the thyroid gland does not release thyroxine to regulate calcium levels, and the parathyroid glands do not release calcitonin. The correct hormones are calcitonin from the thyroid and PTH from the parathyroid glands.