List and briefly describe the function of the following structures: cervical enlargement, lumbar enlargement, Dorsal roots, ventral roots, dorsal root ganglia, spinal nerves, mixed nerves,

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Explanation:

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d. the weight of the book

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.