EVERYDAY SCIENCE

Detailed explanation-1: -The cell membrane encloses the cell. It acts like a gatekeeper-allowing some materials to pass through it, but not others. a gel-like fluid called cytoplasm takes up most of the space inside a cell.

Detailed explanation-2: -What Do Membranes Do? 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-3: -Protein machineries embedded in the membranes of our cells act as ‘gatekeepers’ controlling everything transported in and out of every cell in our bodies. Because these machineries, called membrane embedded proteins, are vital to the way our bodies function they are the target of at least 40% of drugs.

Detailed explanation-4: -The plasma membrane lets certain things into the cell that it needs, but keeps other things out. This is called semipermeable. Inside the cell is a watery medium that everything floats in called cytoplasm. The cytoplasm contains all the working parts of the cell, the organelles.