Which of the following is the primary purpose of the immune response?
To directly attack and kill infected cells.
To produce antigens for recognition by the body.
To regulate the body's metabolism.
To protect the body against pathogens and foreign substances.
The Correct Answer is D
Explanation: The immune response is a complex system of defense mechanisms that aim to protect the body from pathogens, such as bacteria, viruses, and other foreign substances. It involves the activation of various immune cells, production of antibodies, and other immune components to recognize and eliminate the invading pathogens.
Incorrect choices:
a. Directly attacking and killing infected cells is the role of cytotoxic T cells during cell-mediated immunity, but it is not the primary purpose of the overall immune response.
b. Antigens are foreign substances that trigger the immune response. They are not produced by the immune response itself but rather recognized by immune cells and antibodies.
c. The immune response is not involved in regulating the body's metabolism. Metabolism regulation is primarily controlled by other systems in the body, such as the endocrine system.
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Related Questions
Correct Answer is C
Explanation
Explanation: B cells are a type of lymphocyte that plays a central role in the adaptive immune response. When activated by the presence of specific antigens, B cells differentiate into plasma cells, which are responsible for producing large quantities of antibodies that can target and neutralize the invading pathogen.
Incorrect choices:
a. T cells are another type of lymphocyte that is involved in cell-mediated immunity, where they directly attack infected or abnormal cells. They do not produce antibodies.
b. Natural killer cells are part of the innate immune system and are responsible for killing infected or cancerous cells. They are not involved in antibody production.
d. Macrophages are phagocytic cells that engulf and destroy pathogens and debris in the body. While they play a crucial role in immune responses, they do not produce antibodies.
Correct Answer is A
Explanation
Explanation: Systemic lupus erythematosus (SLE) is an autoimmune disorder that can affect multiple organs and systems, including the skin, joints, kidneys, and nervous system. The presence of a "butterfly rash" on the face, joint pain, and skin lesions are common manifestations of SLE.
Incorrect choices:
b. Fibromyalgia is a chronic pain disorder characterized by widespread pain, fatigue, and tender points in specific areas of the body, but it does not typically present with a "butterfly rash" or skin lesions.
c. Multiple sclerosis (MS) is an autoimmune disorder that affects the central nervous system, causing symptoms such as fatigue, muscle weakness, and coordination problems, but it does not typically present with a "butterfly rash" or joint pain.
d. Sjögren's syndrome is an autoimmune disorder that primarily affects the salivary and lacrimal glands, leading to dry eyes and dry mouth, but it does not typically present with a "butterfly rash" or skin lesions.
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