Textbook Question
Which of the following functions is/are performed by complement proteins?
a. Cell lysis
b. Opsonization
c. Enhancing inflammation
d. Only a and b
e. All of the above
842
views
21. The Immune System
Phagocytosis
Problem L2.1c
Textbook Question
Eileen presents with flu-like symptoms, including fever, chills, and body aches.
c. What might it mean if lymphocytes instead of neutrophils were elevated? Explain your reasoning.
Verified step by step guidance1
Understand the role of neutrophils and lymphocytes in the immune system: Neutrophils are the first responders to bacterial infections and are part of the innate immune system. Lymphocytes, including T cells, B cells, and natural killer cells, are part of the adaptive immune system and are more involved in viral infections or chronic immune responses.
Analyze the significance of elevated lymphocytes: Elevated lymphocytes typically indicate the body is responding to a viral infection rather than a bacterial one. This is because lymphocytes are specialized in identifying and targeting virus-infected cells.
Relate the symptoms to the immune response: Flu-like symptoms such as fever, chills, and body aches are commonly associated with viral infections. If lymphocytes are elevated, it supports the hypothesis that Eileen's symptoms are due to a viral infection, such as influenza.
Consider the reasoning behind the immune system's response: The elevation of lymphocytes suggests that the adaptive immune system is actively working to combat the virus. This involves processes like the production of antibodies by B cells and the destruction of infected cells by T cells.
Conclude the importance of the observation: Elevated lymphocytes instead of neutrophils provide a clue to the type of pathogen causing the illness. This information can guide further diagnostic tests or treatments, such as antiviral medications rather than antibiotics, which target bacterial infections.
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Lymphocytes
Lymphocytes are a type of white blood cell that play a crucial role in the immune system, particularly in the adaptive immune response. They are primarily involved in recognizing and responding to specific pathogens, such as viruses. An elevation in lymphocytes often indicates a viral infection or a chronic inflammatory condition, as they are typically activated in response to these types of challenges.
Recommended video:
3:12
Lymphocytes
Neutrophils
Neutrophils are another type of white blood cell, essential for the innate immune response. They are the first responders to sites of infection, particularly bacterial infections, and are characterized by their ability to engulf and destroy pathogens. A decrease in neutrophils, or neutropenia, can suggest a shift in the immune response, often indicating a viral infection or bone marrow suppression.
Recommended video:
5:23Neutrophils
Differential White Blood Cell Count
A differential white blood cell count is a laboratory test that measures the percentage of different types of white blood cells in the blood. This test helps in diagnosing various conditions by indicating the nature of the immune response. An increase in lymphocytes relative to neutrophils can suggest a viral infection, while a predominance of neutrophils typically points to bacterial infections.
Recommended video:
6:08Map of the Lesson on Cells of the Immune System
Related Videos
Related Practice