Which of the following electrolytes is present in human saliva?

Analogy type questions:
$(1)$ Dental formula of an adult human: $\frac{2123}{2123}$ :: Dental formula of a small child: ..............
$(2)$ Goblet cells: Secretion of mucus :: Oxyntic cells: ............

Read the following statements thoroughly and identify whether they are true or false. Choose the right option accordingly.
$I.$ Bile is produced and stored in the liver and gall bladder,respectively.
$II.$ Common bile duct is the fusion of the right and left hepatic duct.
$III.$ Hepato-pancreatic duct opens into the proximal part of the small intestine.
$IV.$ Pancreas consists of two parts,exocrine and endocrine.
$V.$ Pepsinogen,a secretion of chief cells,is activated by hydrochloric acid.
$VI.$ Peptides are converted into dipeptides with the action of carboxypeptidase.

Which of the following statements is incorrect regarding the human digestive system?

Describe the process of digestion occurring in the large intestine.

Assertion : Water and electrolytes are almost fully absorbed in the large intestine.
Reason : In large intestine,haustral contractions (slow segmenting movements) roll the forming faeces over and over,causing absorption of water and electrolytes.