The name Caroline is an American baby name. In American the meaning of the name Caroline is: Manly. French Meaning: The name Caroline is a French baby name. In French the meaning of the name Caroline is: Song of happiness.
Figure 1 summarizes the permeability properties of pure lipid bilayers. Lipid-soluble molecules can readily pass through a lipid bilayer. Examples include gas molecules such as oxygen (O 2) and carbon dioxide (CO 2), steroid molecules, and fat-soluble vitamins (A, D, E, and K). Surprisingly, some small polar molecules are capable of permeating the lipid bilayer without the aid of a membrane transport protein.
Because of the chemistry and fluidity of phospholipid bilayers, certain types of molecules can pass through freely, while other types have no chance without help from the cell. The former types of molecules use a mixture of size, chemistry, and the forces of diffusion to squeeze through what seems to be an impenetrable barrier.