The body obtains sugar from food. Which system most directly affects blood sugar levels?
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Digestive system

Explanation:

The sugar goes straight from the digestive system into the bloodstream after an individual consumes and digests food.

However, glucose can only enter cells if enough insulin is also circulating in the bloodstream. Insulin is a protein that makes cells ready to receive glucose

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.