The gastric cells that secrete hydrochloric acid and intrinsic factor are the

A. CCK is released from the duodenum to promote liver and pancreatic secretion.:CCK (cholecystokinin) is released by duodenal/jejunal enteroendocrine cells and stimulates pancreatic enzyme secretion and gallbladder contraction -this supports digestion but describes a hormonal control mechanism rather than a structural adaptation of the small intestine itself.
B. Large surface area due to the presence of the plicae circulares, villi, and microvilli.:The small intestine’s mucosal folds (plicae circulares), finger-like villi, and microscopic microvilli (brush border) massively increase surface area for absorption.
C. Acid secretions from the stomach are neutralized in the duodenum.:The duodenum receives bicarbonate-rich pancreatic secretions and bile which neutralize gastric acid to create an optimal pH for intestinal enzymes -this is an important functional adaptation that facilitates digestion/absorption but is secondary to the structural surface-area adaptations.
D. The small intestine has haustra and rugae both help in nutrient absorption.:Haustra are sacculations of the large intestine (colon) and rugae are folds in the stomach -neither are features of the small intestine, so this statement is incorrect.

A. Urea: Urea is the major nitrogenous waste normally present in urine.
B. Albumin:Albumin in urine (albuminuria/proteinuria) is abnormal and suggests glomerular damage or increased filtration of plasma proteins.
C. Sodium: Sodium is a normal urinary electrolyte whose excretion varies with intake and hormonal control.
D. Creatinine:Creatinine is a normal waste product excreted in urine and used clinically to assess renal function.