Which of the following are associated with th | vedclass

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(D) The body's defense mechanism,known as the immune system,involves various types of white blood cells $(WBCs)$.$1$. Neutrophils are phagocytic cells

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All of the above

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(D) The body's defense mechanism,known as the immune system,involves various types of white blood cells $(WBCs)$.$1$. Neutrophils are phagocytic cells that act as the first line of defense by engulfing pathogens.$2$. Lymphocytes are specialized cells ($B$-cells and $T$-cells) responsible for the specific immune response,including antibody production and cell-mediated immunity.$3$. Macrophages are large phagocytic cells that ingest cellular debris,foreign substances,and pathogens.Since all these cells play a crucial role in protecting the body against infections,the correct answer is $D$.

Column-$I$	Column-$II$
$1$. Cellular barrier	$A$. Saliva in the mouth
$2$. Physiological barrier	$B$. Interferons
$3$. Cytokine barrier	$C$. Natural killer (type of lymphocyte)
$4$. Physical barrier	$D$. Mucus coating of the respiratory tract

Which of the following are associated with the defense of the body?

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