Pepsinogen is secreted by:

Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.

Which of the following has the highest $pH$?

$A$ portal triad is formed by:
$1.$ Branches of portal vein
$2.$ Branches of hepatic artery
$3.$ Branches of interlobular bile ductule
$4.$ Intralobular vein
Which of the following represents the correct combination?

In the stomach,gastric acid is secreted by the

Which of the following enzymes is not secreted by the pancreas?