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

Introduction to Cell Communication

Anatomy & Physiology

21. The Immune System

Introduction to Cell Communication

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Multiple Choice

In a(n) ________ synapse, current flows directly between cells.

sensory

electrical

mechanical

chemical

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Verified step by step guidance

Step 1: Understand the concept of synapses. Synapses are junctions between two neurons or between a neuron and another cell, allowing communication. There are two main types: electrical and chemical.

Step 2: Learn about electrical synapses. In an electrical synapse, current flows directly between cells through gap junctions, which are specialized channels that connect the cytoplasm of adjacent cells.

Step 3: Compare electrical synapses to chemical synapses. In chemical synapses, communication occurs via neurotransmitters released into the synaptic cleft, rather than direct current flow.

Step 4: Recognize the key characteristic of electrical synapses: the direct flow of ions and electrical current between cells, enabling faster communication compared to chemical synapses.

Step 5: Based on the description provided in the problem, identify that the correct answer is 'electrical,' as it matches the definition of a synapse where current flows directly between cells.