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NEET2019ZoologyHuman Health and DiseasesActual

Humoral immunity in humans is due to

Options

  1. Aperforins secreted by cytotoxic T lymphocytes
  2. Bantibodies secreted by B lymphocytes
  3. Cantibodies transferred from mother to newborn at the time of birth
  4. Dphagocytosis of natural killer cells.

Correct answer

B. antibodies secreted by B lymphocytes

Step-by-step solution

Humoral immunity consists of antibodies that circulate in the body fluids like blood plasma and lymph. B lymphocytes (B cells) produce antibodies that regulate humoral immunity. The T-lymphocytes themselves do not secrete antibodies but help B lymphocytes produce them.

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