Cell membranes are most permeable to non-polar molecules(eg. lipids and cholesterol). Polar molecules can also cross the membrane but require specific transporters, carriers,or channels(eg. sodium, potassium, chlorine, calcium, magnesium, glucose, amino acids, etc...).
The correct answer is diffusion. Diffusion is the process by which materials enter and leave a cell through the cell membrane.
Through the cell membrane. The cell membrane determines weather or not the material is aloud in the cell.
The movement of water and dissolved materials through a cell membrane is called Osmosis.
What you are considering when you are referring to how easily materials can pass through a membrane is how permeable the cell wall or membrane is.
Active transport refers to the movement of materials through the cell membrane when energy is required.
waste the cell produces
Materials exit a cell by active transport by passing through the cell membrane. The membrane is usually semi-permeable which makes it easy to release materials.
oxygen and food
i think its Endocytosis
It doesn't! it just lets some materials that are useful for the cells into the membrane and others out, through diffusion.
Passive transport does not use energy to pass through a cell membrane. active transport uses energy to pass through a cell membrane.
The cell membrane is the border allowing entry and exit of materials through the cell. Both animal and plant cells have one.
The cell membrane
diffusion and osmosis
By the cell membrane located on the outside of an animal or plant cell.
Passive transport is when materials move through the cell membrane without using energy. Active transport is when materials move through the cell membrane using the cell's energy. During Active transport a protein called ATP helps the material get through the cell membrane.
There are tiny pores in the cell membranes so waste and nutrients can pass through.
A cell membrane is a selectivley permeable membrane. This means that it only lets specific materials get in and out of the cell. The cell membrane helps to let only needed materials into the cell and to get unneeded materials out of the cell. (food goes in waste comes out.)