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

Which of the following is an essential characteristic of the blood-brain barrier?

Direct exchange of large molecules between blood and brain tissue

High concentration of red blood cells

Increased blood flow to the brain

Selective permeability to protect the brain from toxins

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Verified step by step guidance

Understand the function of the blood-brain barrier: It serves as a protective shield for the brain, preventing harmful substances from entering the brain tissue while allowing essential nutrients to pass through.

Recognize the concept of selective permeability: This means that the blood-brain barrier allows certain molecules to pass through while blocking others, particularly toxins and pathogens.

Identify the structural components of the blood-brain barrier: It is composed of tightly packed endothelial cells, astrocyte end-feet, and a basement membrane, which together restrict the passage of large molecules.

Consider the physiological importance: The selective permeability of the blood-brain barrier is crucial for maintaining the brain's stable environment, which is necessary for proper neural function.

Evaluate the options given: Direct exchange of large molecules, high concentration of red blood cells, and increased blood flow are not characteristics of the blood-brain barrier. The correct characteristic is its selective permeability to protect the brain from toxins.