Match List I with List II and select the correct answer using the codes given below the Lists: List I (Substance) - List II (Physiological role) 1. I. Ptyalin - A) Converts angiotensinogen in blood into angiotensin 2. II. Pepsin - B) Digests starch 3. III. Renin - C) Digests proteins 4. IV. Oxytocin - D) Hydrolyses fats 5. - E) Induces contraction of smooth muscles Codes:

1. Ptyalin (salivary amylase) is found in saliva and begins the digestion of starch (I-B). 2. Pepsin is an enzyme in the stomach that digests proteins (II-C). 3. Renin (distinct from kidney renin) is an enzyme in the stomach of infants that curdles milk protein; however, the renin involved in blood pressure regulation converts angiotensinogen to angiotensin (III-A). The question context likely refers to the latter physiological role. 4. Oxytocin is a hormone that induces the contraction of smooth muscles, particularly in the uterus and mammary glands (IV-E). 5. Therefore, the correct matching is I-B, II-C, III-A, IV-E.