How does the structure of the membrane relate to its selective permeability? (think about the chemical properties of the inner core of the bi-layer.)

The cell membrane is also called selectively permeable membrane for the sole reason being it is selective in nature.

It forms a physical barrier and as a barrier between the cell and the external environment as it allows only selected necessary molecules to pass through it and at the same time prevents entry of unwanted / unnecessary substances.

It also regulates the entry and exit of molecules into and out of the cell.

The cell membrane permits the entry of vital molecules like

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .