A carrier-mediated transport of vitamin

A substance to be carried forms a complex with a component of the membrane on one side the complex is then carried through the membrane, the drug or substance is released, and the carrier returns to the original surface and state to repeat the process. The carrier shows speciheity for instance, L-dopa but not D-dopa is transported. 

For ion pair transport to take place, organic anions combine with organic cations to form a neutral complex, which is then transported through the membrane by passive diffusion. 

In pinocytosis, the transport of water-insoluble substances such as vitamins A, D, E, and K is accomplished in the following manner. First, they are engulfed by the 

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