Okay, everyone. Granulocytes have what characteristics? Okay. We've been learning about a lot of different immune cells, and we do have to be able to differentiate between all the different types of immune cells and the classes of immune cells. And granulocytes is one of the major classes of immune cells. So let's have a look. Answer choice A says granulocytes travel through the lymphatic system. So the lymphatic system is going to be a network of lymph nodes that moves lymph tissue and lymph fluid throughout your body. But remember, granulocytes travel through the bloodstream, they don't actually travel through the lymphatic system. We're going to learn about the lymphocytes, which are gonna be natural killer cells, T cells, and B cells. They're going to commonly use the lymphatic system. That's where they get their name from. Answer choice b says granulocytes are the most numerous leukocytes in circulation. What does the leukocytes mean? Remember that that means white blood cell. So remember that there are a lot of different cells in the category of leukocyte or white blood cell that includes the granulocytes, the agranulocytes, and the lymphocytes which is a whole bunch of cells. Now, are the granulocytes the most common white blood cells? Yes, they are. In fact, neutrophils, one type of granulocyte, is the most common white blood cell of all. I think it makes up 70% of all of the leukocytes, and that is a type of granulocyte. So, yes, granulocytes are the most abundant and numerous leukocytes in circulation. This is most likely because they are the first to respond to any form of infection or allergic reaction or injury. So that's probably gonna be your answer, but let's look at the other 2. Granulocytes develop in the thymus. So we will learn more about the organ which is known as the thymus later in our lessons, but granulocytes do not develop in the thymus. The t cells of the adaptive immune system are going to develop there. That's where they get the t in their name for thymus. So, that's not what we're looking for. Answer choice d says granulocytes do not contain distinct granules in their cytoplasm. Absolutely, they do. So that's not true. This is where they get their name from. They're called granulocytes because they have granules full of different chemicals that perform different functions depending on the type of granulocyte you're talking about. But usually the chemicals in these granules are used to fight infections. But, yes, they get their names from these granules, so d is not the correct answer. The correct answer here is answer choice b. Granulocytes are the most numerous and abundant leukocyte or white blood cell in circulation. Okay, everyone. Let's move on to our next video.

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
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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

21. The Immune System

Cells of the Immune System: Granulocytes

Anatomy & Physiology

21. The Immune System

Cells of the Immune System: Granulocytes

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Multiple Choice

Granulocytes:

Travel through the lymphatic system.

Are the most numerous leukocyte in circulation.

Develop in the thymus.

Do not contain distinct granules in their cytoplasm.

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Verified step by step guidance

Understand the term 'granulocytes': Granulocytes are a type of white blood cell characterized by the presence of granules in their cytoplasm. These granules contain enzymes that are released during infections, allergic reactions, and asthma.

Identify the types of granulocytes: The main types of granulocytes are neutrophils, eosinophils, and basophils. Each type has a specific role in the immune response.

Clarify the development and location: Granulocytes are produced in the bone marrow, not the thymus. The thymus is primarily involved in the development of T-lymphocytes, another type of white blood cell.

Examine the circulation and function: Granulocytes circulate in the bloodstream and are the most numerous type of leukocytes (white blood cells) in circulation. They play a crucial role in the body's defense against pathogens.

Differentiate from other leukocytes: Unlike agranulocytes (such as lymphocytes and monocytes), granulocytes have distinct granules in their cytoplasm, which are visible under a microscope.