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

21. The Immune System

Cell Communication: Surface Receptors & Adhesion Molecules

Anatomy & Physiology

21. The Immune System

Cell Communication: Surface Receptors & Adhesion Molecules

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Multiple Choice

Which of the following is NOT an example of cells communicating through direct contact?

Interactions between immune cells via cell adhesion molecules

Synaptic signaling between neurons

Gap junctions between cardiac muscle cells

Plasmodesmata in plant cells

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Verified step by step guidance

Step 1: Understand the concept of direct contact communication. Direct contact communication occurs when cells physically interact with each other through structures like cell adhesion molecules, gap junctions, or plasmodesmata. These structures allow for the exchange of signals or materials directly between adjacent cells.

Step 2: Analyze the examples provided in the question. Each example represents a type of cell communication. Determine whether each example involves physical contact between cells or not.

Step 3: Evaluate 'Interactions between immune cells via cell adhesion molecules.' Cell adhesion molecules facilitate direct physical contact between immune cells, allowing them to communicate. This is an example of direct contact communication.

Step 4: Evaluate 'Gap junctions between cardiac muscle cells.' Gap junctions are specialized structures that connect adjacent cardiac muscle cells, enabling the direct transfer of ions and electrical signals. This is another example of direct contact communication.

Step 5: Evaluate 'Synaptic signaling between neurons.' Synaptic signaling involves the release of neurotransmitters into the synaptic cleft, a small gap between neurons. Since this communication does not involve direct physical contact, it is NOT an example of direct contact communication.