Consider the following statements regarding the immune response in humans: 1. Cell-mediated immunity is primarily mediated by T lymphocytes, which directly destroy virus-infected host cells and tumor cells. 2. Humoral immunity involves B lymphocytes differentiating into plasma cells that secrete circulating antibodies into body fluids. Which of the statements given above is/are correct?

💡 Solution & Explanation

Adaptive immunity in humans comprises cell-mediated and humoral branches. T lymphocytes mature in the thymus and execute cell-mediated responses by attacking infected or abnormal cells, while B lymphocytes mature in bone marrow and drive humoral immunity by secreting antigen-specific antibodies into blood and lymph. Both lymphocyte populations originate from hematopoietic stem cells in bone marrow.