Which of the following processes would be considered as a secretory rather than an excretory activity?

feces elimination by the colon
sweat removal by the skin
carbon dioxide removal by the lungs
aldosterone release by the adrenal glands

aldosterone release by the adrenal glands

Explanation:

The excretion usually refers to separation and removal of substance generated in the body, out of the body. So, excretory organs in the human body are kidneys, ureters, urinary bladder, lungs, urethra, etc and excretory materials tears, urine, co2, sweat, feaces, etc.

On the other hand, secretion is described the movement of material (not removal) from one point to another. So, examples of secretory organs are endocrine glands and some of secreted materials are hormones, saliva, enzymes, etc.

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.