In the alimentary canal, absorption of glucose and amino acids takes place by 

In the alimentary canal, absorption of glucose and amino acids takes place by simple diffusion, facilitated diffusion and active transport. Small amounts of glucose and amino acids can undergo passive diffusion, their efficient entry into the bloodstream predominantly relies on facilitated transport. This specialised mechanism involves the aid of carrier proteins, ensuring a controlled and effective absorption against concentration gradients. 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.