What characteristics must a substance have in order to be easily transported across the cell membrane?

There are three factors that a substance must have in order to diffuse through a cell membrane.

1. A substance should have the right concentration in order to diffuse through membrane as we know that molecules can only diffuse through areas of high concentration to a lower concentration. Hence the substance should have higher concentration that the cell to diffuse through the membrane.

2. The substance should not be charged as the cell membranes do not allow charged particles to enter into the cell unless the cell has electrical potential.

3. The size of the particles matters as molecules of smaller size can easily diffuse through the cell membrane

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.