I'm not sure if you're talking about plant cells, or animal, but it would be either the cell wall or cell membrane.
The Plasma membrane regulates what enters and exits the cell.
nuclear ,membrane
It is known to be the organelle it is the function in where things can enter an exit the nucleus.
The cell membrane, because it controls what enters and leaves the cell. The cell membrane tries to prevent malicious bacteria from causing harm.
Living cells maintain homoeostasis by controlling materials that enter and leave the cell. This is made possible through the permeable cell membrane which is selective on the substances that pass through it.
cell membrane
Oxygen enters the blood to become available to cells.
Cellular respiration starts in the cytoplasm of the cell, and then enters the mitochondria.
The Plasma membrane regulates what enters and exits the cell.
A desert rattlesnake enters an underground burrow on a hot summer day.
nuclear ,membrane
The PRV is usually fitted where the incoming water supply enters a building.
It is known to be the organelle it is the function in where things can enter an exit the nucleus.
The cell membrane helps a cell maintain homoeostasis by regulating the movement of substances in and out of the cell. The cell membrane is a lipid bilayer which is selectively permeable to substances.
The cell membrane, because it controls what enters and leaves the cell. The cell membrane tries to prevent malicious bacteria from causing harm.
Living cells maintain homoeostasis by controlling materials that enter and leave the cell. This is made possible through the permeable cell membrane which is selective on the substances that pass through it.
its the cell membrane - not to be confused with the cell wall