Textbook Question
More than one choice may apply.
Which of the following formed elements are phagocytic?
a. Erythrocytes
b. Neutrophils
c. Monocytes
d. Lymphocytes
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17. The Blood
Leukocytes
Problem 15
Textbook Question
Name the three types of lymphocytes and identify their functions.
Verified step by step guidance1
Step 1: Understand that lymphocytes are a type of white blood cell crucial for the immune system. They are primarily involved in defending the body against pathogens and abnormal cells.
Step 2: Identify the three main types of lymphocytes: T cells, B cells, and natural killer (NK) cells.
Step 3: Learn the function of T cells: T cells are responsible for cell-mediated immunity. They help destroy infected or cancerous cells and regulate immune responses. Subtypes include helper T cells (which activate other immune cells) and cytotoxic T cells (which directly kill infected cells).
Step 4: Learn the function of B cells: B cells are responsible for humoral immunity. They produce antibodies that bind to specific antigens on pathogens, marking them for destruction by other immune cells.
Step 5: Learn the function of natural killer (NK) cells: NK cells are part of the innate immune system. They target and destroy virus-infected cells and tumor cells without requiring prior activation or antigen recognition.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
B Lymphocytes
B lymphocytes, or B cells, are a type of white blood cell that plays a crucial role in the adaptive immune response. They are responsible for producing antibodies, which are proteins that specifically target and neutralize pathogens such as bacteria and viruses. Upon encountering an antigen, B cells can differentiate into plasma cells that secrete large quantities of antibodies, providing long-term immunity.
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T Lymphocytes
T lymphocytes, or T cells, are another essential type of lymphocyte involved in the immune response. They are primarily responsible for cell-mediated immunity, which involves directly attacking infected or cancerous cells. T cells can be further divided into helper T cells, which assist other immune cells, and cytotoxic T cells, which kill infected cells. Their activation is crucial for orchestrating a robust immune response.
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Natural Killer Cells
Natural Killer (NK) cells are a unique subset of lymphocytes that play a vital role in the innate immune system. Unlike B and T cells, NK cells do not require prior sensitization to recognize and destroy infected or tumor cells. They are equipped with receptors that allow them to identify stressed or abnormal cells, leading to their rapid response in eliminating threats without the need for antibodies.
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