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

17. The Blood

Introduction To Blood

Anatomy & Physiology

17. The Blood

Introduction To Blood

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Multiple Choice

The blood-brain barrier (BBB) is most permeable to which of the following?

Bacteria

Red blood cells

Proteins

Glucose

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Verified step by step guidance

Understand the function of the blood-brain barrier (BBB): The BBB is a selective permeability barrier that protects the brain from potentially harmful substances in the bloodstream while allowing essential nutrients to pass through.

Identify the types of substances that can pass through the BBB: The BBB is most permeable to small, non-polar molecules and certain essential nutrients, such as glucose, which is crucial for brain function.

Consider the characteristics of each option: Bacteria, red blood cells, and proteins are generally large and polar, making them less likely to pass through the BBB compared to small, non-polar molecules like glucose.

Recognize the importance of glucose for brain function: Glucose is a primary energy source for the brain, and the BBB has specific transport mechanisms to facilitate its passage.

Conclude that glucose is the most permeable substance through the BBB among the given options, due to its small size and essential role in brain metabolism.