The cell's membrane allows only certain substances to diffuse in and out of the cell.
Substances will move from an area of high concentration to an area of low concentration in order to achieve equilibrium. Inside the cell, substances will diffuse out if the concentration outside is higher, and substances will diffuse in if the concentration outside is lower, until equilibrium is reached.
Lipid-soluble substances, such as oxygen, carbon dioxide, and small non-polar molecules, easily diffuse across the cell membrane. These substances can pass through the lipid bilayer of the membrane without the need for specific transport proteins.
into the cell to create equilibrium. This process is known as osmosis. The direction of water movement is determined by the concentration gradient of water molecules between the inside and outside of the cell.
Size. Actually very few substances are able to diffuse across the menbrane, most must be transported ie facilitated diffusion, active transport, or receptor-mediated endocytosis. Carbon dioxide, oxygen, water, and some lipid substances are able to diffuse across the membrane
The cell part that allows only certain substances to diffuse into and out of the cell is called the semi permeable membrane. This allows good substances to enter the cell.
The cell's membrane allows only certain substances to diffuse in and out of the cell.
Substances will move from an area of high concentration to an area of low concentration in order to achieve equilibrium. Inside the cell, substances will diffuse out if the concentration outside is higher, and substances will diffuse in if the concentration outside is lower, until equilibrium is reached.
Lipid-soluble substances, such as oxygen, carbon dioxide, and small non-polar molecules, easily diffuse across the cell membrane. These substances can pass through the lipid bilayer of the membrane without the need for specific transport proteins.
CO2, H2O, and O2 can all diffuse across a cell membrane. Also, small polar molecules (uncharged) and hydrocarbons easily diffuse across.
Electrons flow in the opposite direction.
Electrons flow in the opposite direction.
Substances that are small, nonpolar, and uncharged will diffuse through a membrane easily. This includes gases like oxygen and carbon dioxide, as well as small lipophilic molecules. Larger or charged molecules may require assistance from transport proteins to cross the membrane.
The substances flow from high concentration to low concentration through channels found in the cell membrane. Basically like a bridge.
You are looking at a hypertonic solution, where there is a higher amount of salt outside the cell than there is inside the cell. The water inside the cell will diffuse out, which causes the cell to shrink. This is why your fingers shrivel in the bathtub. The opposite will happen in a hypotonic solution. The cell has more salt than the outside, and the water will diffuse into the cell, causing it to swell.
excretion, transport and respiration
No, oxygen cannot directly diffuse across a cell membrane. Instead, it crosses the cell membrane with the help of specific transport proteins, such as aquaporins and oxygen channels. These proteins facilitate the movement of oxygen from areas of high concentration to low concentration.