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

17. The Blood

Erythrocytes

Anatomy & Physiology

17. The Blood

Erythrocytes

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following is true of the structure of an erythrocyte?

It lacks a nucleus when mature.

It contains numerous mitochondria.

It has a spherical shape with surface projections.

It is covered in cilia to aid movement.

Previous problemNext problem

Verified step by step guidance

Understand the function of erythrocytes (red blood cells): Their primary role is to transport oxygen and carbon dioxide in the blood. This function is closely tied to their structure.

Recall the unique structural features of mature erythrocytes: They lack a nucleus and most organelles, including mitochondria, to maximize space for hemoglobin, the protein responsible for oxygen transport.

Consider the shape of erythrocytes: They are biconcave discs, not spherical, which increases their surface area for gas exchange and allows flexibility to pass through narrow capillaries.

Evaluate the presence of surface projections or cilia: Erythrocytes do not have cilia or surface projections. Their movement is passive, carried by the flow of blood rather than active propulsion.

Conclude that the correct statement about erythrocytes is: 'It lacks a nucleus when mature,' as this is a defining characteristic of their structure and function.