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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

17. The Blood

Erythrocytes: Hemoglobin

Anatomy & Physiology

17. The Blood

Erythrocytes: Hemoglobin

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Multiple Choice

What is the complete hemoglobin molecule composed of?

Four polypeptide chains and two heme groups

Two polypeptide chains and four heme groups

Two polypeptide chains and two heme groups

Four polypeptide chains and four heme groups

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Verified step by step guidance

Understand that hemoglobin is a protein found in red blood cells responsible for transporting oxygen throughout the body.

Recognize that a complete hemoglobin molecule is composed of four polypeptide chains. These chains are typically two alpha chains and two beta chains.

Each polypeptide chain in hemoglobin is associated with a heme group. A heme group is a complex molecule containing an iron ion that can bind to oxygen.

Since there are four polypeptide chains in a hemoglobin molecule, there are also four heme groups, one attached to each chain.

Therefore, the complete hemoglobin molecule is composed of four polypeptide chains and four heme groups, allowing it to carry up to four oxygen molecules.