GENERAL HISTOLOGY

Detailed explanation-1: -The membrane that allows some of the molecules to pass through it and prevent the others is called. A. permeable membrane. No worries!

Detailed explanation-2: -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.

Detailed explanation-3: -The phospholipids are tightly packed together, and the membrane has a hydrophobic interior. This structure causes the membrane to be selectively permeable. A membrane that has selective permeability allows only substances meeting certain criteria to pass through it unaided.

Detailed explanation-4: -The cell membrane’s main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others.

Detailed explanation-5: -The answer is proteins. Proteins dot the surface of the bilayer, floating like rafts. Some of these proteins have channels, or doors between the cell and the environment. The channels let larger things that are hydrophilic and normally couldn’t pass through the membrane into the cell.