Table of contents

1. Introduction to Anatomy & Physiology5h 42m
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 Heart2h 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

Atoms- Smallest Unit of Matter

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Atoms- Smallest Unit of Matter

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Multiple Choice

What is generally true about essential elements and living organisms?

All organisms require 25 of the 92 naturally occurring elements to survive.

The elements carbon, hydrogen, nitrogen, and oxygen make up 20–25% of living mass.

Given their low concentrations in nature, the toxicity of some elements is generally not a factor in the evolution of biological communities.

Although all forms of life require iron, other elements are required only by certain species.

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Verified step by step guidance

Understand that essential elements are those required for an organism to grow, develop, and reproduce. These elements are crucial for various biochemical processes.

Recognize that not all naturally occurring elements are required by all organisms. While some elements like carbon, hydrogen, nitrogen, and oxygen are universally essential, others are needed only by specific organisms.

Consider the role of iron as a universally required element. Iron is a key component of hemoglobin in humans and is involved in electron transport chains in many organisms.

Acknowledge that the requirement for certain elements can vary between species. For example, iodine is essential for humans for thyroid function, but not all organisms require it.

Reflect on the fact that the concentration of elements in nature can influence their role in biological communities. Some elements may be toxic at high concentrations, but their low natural abundance often mitigates this risk.