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- Density

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Properties of Water- Density

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Multiple Choice

Solid substances are normally more dense than liquid substances. However, solid ice is LESS dense than liquid water. Why is this characteristic of solid ice important for life?

This characteristic allows lakes to freeze solid.

This characteristic allows the surface water of lakes to freeze.

This characteristic ensures that salt water does not freeze.

This characteristic is not important for life.

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Verified step by step guidance

Understand the concept of density: Density is defined as mass per unit volume. Typically, solids are denser than their liquid forms because their molecules are packed more tightly together.

Recognize the unique property of water: Unlike most substances, water expands when it freezes. This is due to the hydrogen bonding in water molecules, which forms a crystalline structure in ice that takes up more space than in liquid form.

Relate this property to ice's density: Because ice expands and occupies more volume, it becomes less dense than liquid water. This is why ice floats on water.

Consider the ecological impact: When ice forms on the surface of bodies of water, it insulates the water below, maintaining a relatively stable environment for aquatic life during cold periods.

Conclude the importance for life: The floating ice layer prevents entire bodies of water from freezing solid, allowing life to survive beneath the ice during winter months. This characteristic is crucial for the survival of aquatic ecosystems.