Multiple Choice
White blood cells use __________ to help identify foreign substances in the body.
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41. Immune System
Immune System
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Which of the following best describes the primary function of T cells in the immune system?
A
They directly attack and destroy infected or cancerous cells.
B
They produce antibodies to neutralize pathogens.
C
They act as physical barriers to prevent pathogen entry.
D
They transport oxygen to tissues throughout the body.
Verified step by step guidance1
Understand the role of T cells in the immune system: T cells are a type of lymphocyte (white blood cell) that play a central role in the adaptive immune response.
Differentiate between the types of T cells: Helper T cells (CD4+) assist other immune cells by releasing cytokines, while cytotoxic T cells (CD8+) directly attack and destroy infected or cancerous cells.
Eliminate incorrect options: T cells do not produce antibodies (this is the role of B cells), do not act as physical barriers (this is the role of skin and mucous membranes), and do not transport oxygen (this is the role of red blood cells).
Focus on the correct function: Cytotoxic T cells recognize infected or abnormal cells through antigens presented on their surface and induce apoptosis (programmed cell death) to eliminate these cells.
Conclude that the best description of the primary function of T cells is their ability to directly attack and destroy infected or cancerous cells.
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