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

2. Cell Chemistry & Cell Components

Introduction to Chemical Bonding

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Chemical Bonding

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Multiple Choice

Which statement about calcium metabolism is true?

Vitamin D decreases calcium absorption in the intestines.

Parathyroid hormone increases blood calcium levels by stimulating osteoclast activity.

Calcitonin increases blood calcium levels by promoting bone resorption.

Calcium levels in the blood are primarily regulated by the thyroid gland.

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Verified step by step guidance

Begin by understanding the role of calcium in the body, which is crucial for bone health, muscle function, and nerve signaling.

Recognize the key hormones involved in calcium metabolism: Parathyroid hormone (PTH), calcitonin, and vitamin D.

Parathyroid hormone (PTH) is secreted by the parathyroid glands and plays a significant role in increasing blood calcium levels. It does this by stimulating osteoclast activity, which breaks down bone tissue and releases calcium into the bloodstream.

Calcitonin, produced by the thyroid gland, has the opposite effect of PTH. It lowers blood calcium levels by inhibiting osteoclast activity, thus reducing bone resorption.

Vitamin D enhances calcium absorption in the intestines, not decreases it. It is essential for maintaining adequate blood calcium levels and supporting bone health.