$(a)$ Which enzyme initiates the digestion of proteins? Name the other enzyme produced by the same gland.
$(b)$ How would the digestion of proteins and carbohydrates be affected if the pancreatic duct is completely blocked?

(N/A) $Pepsin$ is the enzyme that initiates the digestion of proteins in the stomach. The other enzyme produced by the gastric glands is $Gastric \ lipase$.
$(b)$ If the pancreatic duct is completely blocked, the pancreatic juice containing enzymes like $Trypsin$ (for protein digestion) and $Pancreatic \ amylase$ (for carbohydrate digestion) will not reach the small intestine. Consequently, the digestion of proteins and carbohydrates will be severely impaired, leading to malabsorption of nutrients.