Which of the following glandular secretions involved in digestion would be most likely released initially as inactive precursors ?
(1) protein-digesting enzymes
(2) fat-solublizing bile salts
(3) acid-neutralising bicarbonate
(4) hormones such as gastrin
(1) Proteolytic enzymes are strong enzymes and if released in activated form can damage the gland or its duct. Thus, they are commonly released as inactive precursors called zymogens such as trypsinogen and pepsinogen.