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

Introduction to Chemical Bonding

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Chemical Bonding

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Multiple Choice

In the context of cell communication, which stain is used to stain the background in the capsule stain?

India Ink

Methylene Blue

Crystal Violet

Safranin

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Verified step by step guidance

Understand the purpose of a capsule stain: Capsule staining is used to visualize the capsule of bacteria, which is a protective layer that surrounds the cell wall. The capsule is often not stained by conventional methods, so special techniques are used.

Identify the role of the background stain: In capsule staining, the background is stained to create contrast, allowing the capsule to appear as a clear halo around the stained cell.

Review common stains used in microbiology: India Ink is a common choice for capsule staining because it provides a dark background, making the capsule visible as a clear area. Methylene Blue, Crystal Violet, and Safranin are typically used for other types of staining, such as Gram staining.

Consider the properties of India Ink: India Ink is a colloidal suspension of carbon particles that does not penetrate the capsule, thus staining the background and leaving the capsule clear.

Conclude the selection of the stain: Based on the properties and purpose of the stains, India Ink is the correct choice for staining the background in capsule staining, as it highlights the capsule effectively.