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

Properties of Water- The Universal Solvent

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Properties of Water- The Universal Solvent

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Multiple Choice

Where is most of the fresh water available for human consumption found?

In the atmosphere

In rivers and lakes

In underground aquifers

In glaciers and ice caps

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Verified step by step guidance

Begin by understanding the distribution of Earth's water. Approximately 97% of Earth's water is saltwater found in oceans, leaving only about 3% as freshwater.

Next, recognize that the majority of freshwater is not readily accessible for human use. About 68.7% of freshwater is trapped in glaciers and ice caps, primarily in Antarctica and Greenland.

Consider the remaining freshwater sources. A significant portion, approximately 30.1%, is found in underground aquifers. These are layers of permeable rock, sand, or gravel that hold water and can be tapped for human consumption.

Evaluate other sources of freshwater. Only a small fraction, about 1.2%, is found in surface water bodies such as rivers and lakes, which are more directly accessible but constitute a minor portion of the total freshwater supply.

Conclude that while rivers and lakes are important for immediate human use, the largest accessible source of freshwater for human consumption is underground aquifers, which store a substantial amount of the planet's freshwater resources.