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

3. Energy & Cell Processes

Introduction to Metabolism

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to Metabolism

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Multiple Choice

Which of the following by-products of metabolism is the most toxic?

Carbon dioxide

Ammonia

Lactic acid

Urea

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Verified step by step guidance

Understand that metabolism produces various by-products, some of which can be toxic to the body.

Recognize that carbon dioxide, ammonia, lactic acid, and urea are all by-products of different metabolic processes.

Consider the toxicity of each by-product: Carbon dioxide is a waste product of cellular respiration and is expelled through breathing. Lactic acid is produced during anaerobic respiration and can cause muscle fatigue but is not highly toxic. Urea is a less toxic form of ammonia, converted in the liver for safer excretion.

Focus on ammonia: It is a by-product of protein metabolism and is highly toxic to cells, especially in the brain, if not converted to urea.

Conclude that ammonia is the most toxic by-product among the options listed, due to its potential to disrupt cellular function and cause harm if not properly managed by the body.