When hormone concentrations are high, the gland will produce of the hormone.

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Explanation:

Hormones are chemical messengers produced by glands called Endocrine glands into the bloodstream in order to effect a change in a particular region of the body. Endocrine glands are those organs that secrete specific hormones e.g pancreas, pituitary gland etc.

When hormone concentrations are low in the blood, the gland will produce more amount of the hormone while the glands will produce lesser amount of hormone when there is a high concentration of hormones.

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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.