Choose the correct set of statements with reference to absorption in the gastro intestinal tract of human.

(a)Sodium, glucose and aminoacids are absorbed by active transport

(b) Fattyacids and glycerol being insoluble can be absorbed into blood

(c) Simple sugars and alcohol are absorbed in the stomach

(d) Chloride ions are absorbed into blood against concentration gradient

Active transport occurs against the concentration gradient and hence requires energy. Various nutrients like amino acids, monosaccharides like glucose, electrolytes like Na+ are absorbed into the blood by this mechanism.

Fatty acids and glycerol being insoluble, cannot be absorbed into the blood. They are first incorporated into small droplets called micelles which move into the intestinal mucosa. They are re-formed into very small protein coated fat globules called the chylomicrons which are transported into the lymph vessels (lacteals) in the villi. These lymph vessels ultimately release the absorbed substances into the blood stream.

Chloride ions are generally absorbed by simple diffusion.