NURSING ANM AND GNM

Detailed explanation-1: -They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly. Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly.

Detailed explanation-2: -The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot.

Detailed explanation-3: -Charged atoms or molecules of any size cannot cross the cell membrane via simple diffusion as the charges are repelled by the hydrophobic tails in the interior of the phospholipid bilayer.

Detailed explanation-4: -What Makes the Cell Membrane Selectively Permeable? The cell membrane is selectively permeable due to its structure. The phospholipids are arranged in a bilayer with the hydrophobic tails facing inward. The tails are packed tightly together, thus preventing any large molecules from diffusing through.

Detailed explanation-5: -Small non polar molecules (oxygen, nitrogen, carbondioxide) can easily pass through the cell membrane. Uncharged polar molecules-small (water, ammonia, glycerol) and large (glucose, sucrose) can partially pass through the cell membrane.