Duct leading from parotid gland and opening into vestibule is 

1. Haversian duct

2. Stenson's duct

3. Wolffian duct

4. Infra-orbital duct

Wharton's duct is associated with 

1. sub-lingual salivary duct

2. parotid salivary duct

3. sub-maxillary salivary gland

4. Brunner's glands

The optimum pH for the enzyme salivary amylase is:

(1) 4.5

(2) 6.8

(3) 7.3

(4) 8.2

Which one of the following pairs of the kind of cells and their secretion is correctly matched ?

(1) Oxyntic cells --- a secretion with pH between 2.0 and 3.0

(2) Alpha cells of islets of Langerhans ---- secretion that decreases blood sugar level

(3) Kupffer cells --- a digestive enzyme that hydrolyses nucleic acids

(4) Sebaceous glands --- a secretion that evaporates for cooling

Wharton's duct is the duct of

(1) submandibular salivary gland

(2) paritid gland

(3) sublingual gland

(4) all of these.