Final answer:
Lipid-soluble materials can easily pass through plasma membranes due to the hydrophobic lipid core. This includes substances like fat-soluble vitamins, fat-soluble drugs, and gases like oxygen and carbon dioxide.
Step-by-step explanation:
Recall that plasma membranes have hydrophilic and hydrophobic regions. This characteristic helps the movement of certain materials through the membrane and hinders the movement of others. Lipid-soluble material can easily slip through the hydrophobic lipid core of the membrane. Substances such as the fat-soluble vitamins A, D, E, and K readily pass through the plasma membranes in the digestive tract and other tissues. Fat-soluble drugs also gain easy entry into cells and are readily transported into the body's tissues and organs. Molecules of oxygen and carbon dioxide have no charge and pass through by simple diffusion.