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

pH Scale

Anatomy & Physiology

2. Cell Chemistry & Cell Components

pH Scale

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Multiple Choice

Which of the following statements about buffers is true?

They maintain a consistent pH only when acids are added to them, but not bases.

They maintain a consistent pH of 7.

They fluctuate in pH when acids are added to them.

They maintain a consistent pH when acids or bases are added to them.

They fluctuate in pH when acids or bases are added to them.

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Verified step by step guidance

Understand the role of buffers: Buffers are solutions that resist changes in pH when small amounts of acids or bases are added. They help maintain a stable pH in biological systems.

Identify the components of a buffer system: A typical buffer consists of a weak acid and its conjugate base, or a weak base and its conjugate acid. These components work together to neutralize added acids or bases.

Analyze the effect of adding acids: When an acid is added to a buffer, the conjugate base component of the buffer will react with the added hydrogen ions (H⁺) to minimize the change in pH.

Analyze the effect of adding bases: When a base is added to a buffer, the weak acid component of the buffer will donate hydrogen ions (H⁺) to neutralize the added hydroxide ions (OH⁻), again minimizing the change in pH.

Conclude the true statement: Based on the function of buffers, the correct statement is that buffers maintain a consistent pH when acids or bases are added to them, as they are designed to resist changes in pH.