Why Correct: Pancreatic juice contains high concentrations of pancreatic amylase, which digests starch into maltose and dextrins in the small intestine.
Distractor Analysis: Brain tissue produces neurotransmitters but not digestive enzymes. Blood contains hormones and plasma proteins but minimal amylase. Thyroid gland secretes thyroxine and calcitonin hormones, not digestive enzymes.
Takeaway: Salivary glands also produce salivary amylase (ptyalin), but pancreatic amylase is more significant for complete starch digestion.

Why Correct: Gastric glands secrete pepsinogen, which hydrochloric acid converts to pepsin in the stomach, breaking proteins into peptides.
Distractor Analysis: Insulin is a pancreatic hormone regulating blood glucose. Ptyalin is salivary amylase breaking starch in the mouth. Trypsin is a pancreatic protease acting in the small intestine.
Takeaway: Gastric juice contains HCl, pepsin, and mucus; HCl activates pepsinogen to pepsin and kills microbes.

Why Correct: Ruminants are herbivorous mammals with a specialized four-chambered stomach (rumen, reticulum, omasum, abomasum) that allows them to ferment plant material through microbial digestion and regurgitate cud for re-chewing.
Distractor Analysis: Dogs are carnivores with a simple monogastric stomach adapted for digesting meat. Pigeons are birds with a two-part stomach (proventriculus and gizzard) for grinding seeds. Chameleons are reptiles with a simple stomach for digesting insects.
Takeaway: Other common ruminants include goats, sheep, deer, buffalo, and giraffes, while horses and rabbits are non-ruminant herbivores that use hindgut fermentation.