What is meant by unidirectional transport and bidirectional transport of food?
Small amounts of monosaccharides like glucose, amino acids and some of electrolytes like chloride ions are absorbed by (i). However, some of the substances like fructose and some amino acids are absorbed by the mechanism called (ii). Various nutrients like amino acids and electrolytes like Na+ are absorbed into the blood by (iii).
a) i) facilitated transport ii) active transport iii) simple diffusion
b) i) simple diffusion ii) facilitated transport iii) active transport
c) i) active transport ii) facilitated transport iii) simple diffusion
d) i) simple diffusion ii) active transport iii) facilitated transport