If there is the concentration of substance inside the cell is lesser than outside and cell membrane is permeable to the substance.
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
Nonpolar molecules like lipid-soluble substances (e.g., steroid hormones, oxygen, and carbon dioxide) are most likely to passively diffuse across the plasma membrane by dissolving in the lipid bilayer. This type of diffusion does not require a specific transport protein and can occur directly through the phospholipid bilayer due to the molecules' hydrophobic nature.
Diffusion across a membrane in biology is referred to as 'osmosis' & osmosis is the process by which solvent molecules move from a region of high conc. to low concentration and this can therefore occur only in one direction at a time for a perticular solution. this is a really smart answer im surprised
No, fat particles are too large to diffuse easily through the cell membrane. Oxygen particles, being smaller, can diffuse freely into cells for cellular respiration.
I believe the answer is when it is uncharged.
An enzyme secreted by pancreatic cells is most likely targeted to the digestive system, specifically the small intestine. It enters the small intestine through the pancreatic duct to aid in the digestion and breakdown of nutrients in food.
An electrolyte is a substance that conducts electricity when dissolved in water. To determine if a substance is an electrolyte, you can test its ability to conduct electricity in a solution. If the substance allows electric current to flow through the solution, it is likely an electrolyte.
In your small intestine
an ion
A larger molecule or a polar molecule that cannot passively diffuse through the cell membrane would most likely be actively transported. Examples include glucose, ions (such as sodium and potassium), and amino acids.
Large intestine