Assertion : PMNL are type of lymphocytes and natural killer cells are type of neutrophils
Reason : macrophages in the tissues are physiological barriers.

WBC,PMNL monocytes and natural killer cells are then examples of

Name the types of cell produced by neural tissue.

Assertion (A): Innate immunity is non-specific type of defence present at the time of birth. Reason (R): Saliva, tears and sweat act as physiological barriers for innate immunity.

Assertion : Natural Killer cells are found in blood. Reson : These are type of lymphocytes.

Assertion : Natural Killer cells are found in blood. Reson : These are type of lymphocytes.

Assertion : Natural Killer cells are found in blood. Reson : These are type of lymphocytes.

Assertion: Macrophages occur only in the connective tissue. Reason: Role of neutrophils is different from that of macrophages.

Name and explain the type of barriers which involve macrophages.