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

Cell Junctions

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Cell Junctions

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Multiple Choice

Which of the following best describes tight junctions?

They anchor cells to the extracellular matrix.

They facilitate communication between cells through direct cytoplasmic connections.

They allow the passage of ions and small molecules between cells.

They create a watertight seal between adjacent cells.

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Verified step by step guidance

Understand the function of tight junctions: Tight junctions are specialized connections between adjacent cells that create a watertight seal, preventing the passage of substances between the cells.

Differentiate tight junctions from other types of cell junctions: Unlike anchoring junctions, which attach cells to the extracellular matrix, or gap junctions, which allow communication through cytoplasmic connections, tight junctions focus on sealing spaces between cells.

Consider the physiological role of tight junctions: They are crucial in tissues where a barrier is needed, such as in the epithelial lining of organs, to prevent leakage of materials between cells.

Visualize the structure: Tight junctions are formed by a network of claudins and occludins, proteins that interlock to form a continuous seal around the cell perimeter.

Apply this understanding to the options given: Recognize that the option describing tight junctions as creating a watertight seal between adjacent cells is the most accurate description of their function.