What is the main purpose of including warm-up and cool down periods in exersise sessions to prevent injuries to improve endurance to maintain muscle size to increase strength

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.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .