Like cations, chlorine anions
actively participate in the regulation of
the [?] of tissues and cells by
crossing the cellular membrane and
avoiding entrance of into the cell
or excessive loss of water from the cell.

anions have an important role
for the acid-base balance of the
organism since they participate, along
with bi anions, in the pH
buffer system of the body. Another
function of chlorine is in the digestive
physiology: inside the gastri,
hydrochloric acid secreted by stomach
cells ionizes itself into hydrogen and
chlorine ions lowering the pH of the
gastric juice and then permitting the
enzy digestion to take place.