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

Leukocytes

Anatomy & Physiology

17. The Blood

Leukocytes

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Problem 7

Textbook Question

More than one choice may apply.
Which of the following formed elements are phagocytic?
a. Erythrocytes
b. Neutrophils
c. Monocytes
d. Lymphocytes

Verified step by step guidance

Understand the term 'phagocytic': Phagocytic cells are those that can engulf and digest pathogens, debris, or other particles through a process called phagocytosis. This is a key function in the immune system.

Review the function of erythrocytes (red blood cells): Erythrocytes are primarily responsible for transporting oxygen and carbon dioxide in the blood. They do not have phagocytic capabilities.

Examine neutrophils: Neutrophils are a type of white blood cell and are highly phagocytic. They are part of the innate immune system and are often the first responders to infection, engulfing and destroying pathogens.

Analyze monocytes: Monocytes are another type of white blood cell that can differentiate into macrophages or dendritic cells, both of which are phagocytic. Monocytes themselves also exhibit phagocytic activity.

Consider lymphocytes: Lymphocytes, including T cells, B cells, and natural killer cells, are primarily involved in adaptive immunity and do not perform phagocytosis. Their role is more focused on recognizing and responding to specific antigens.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Phagocytosis

Phagocytosis is a cellular process in which certain cells, known as phagocytes, engulf and digest foreign particles, bacteria, and dead or dying cells. This process is crucial for the immune response, as it helps to eliminate pathogens and debris from the body. Phagocytic cells play a vital role in both innate and adaptive immunity.

Types of White Blood Cells

White blood cells, or leukocytes, are essential components of the immune system, and they can be categorized into different types based on their functions. Neutrophils and monocytes are key phagocytic cells, while lymphocytes are primarily involved in adaptive immunity. Understanding the roles of these cells helps in identifying which formed elements are phagocytic.

Erythrocytes vs. Leukocytes

Erythrocytes, or red blood cells, are responsible for transporting oxygen throughout the body and do not have a role in phagocytosis. In contrast, leukocytes, or white blood cells, include various types that are involved in immune responses, including phagocytosis. Recognizing the differences between these cell types is essential for answering questions about immune functions.