GENERAL HISTOLOGY

Detailed explanation-1: -Cell membranes serve as barriers and gatekeepers. 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-2: -By acting as a gatekeeper, the plasma membrane protects the cell from its surroundings and keeps important molecules from leaving the cell, so that the correct balance of molecules is maintained.

Detailed explanation-3: -Everything that a plant needs to grow first needs to pass through its cells’ membranes, which are guarded by a sieve of microscopic pores called aquaporins. “Aquaporins (AQPs) are ancient channel proteins that are found in most organisms, from bacteria to humans.

Detailed explanation-4: -Cell Membrane-The outside boundary of the animal cell, the part next to the cell wall in a plant. In both cells, it controls what enters and exits the cell.